Medical specialists – Top Doctors UK
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Professional statement

Mr Togay Koç is a highly experienced, well-regarded consultant orthopaedic foot and ankle surgeon based in Southampton and Winchester. He specialises in acute and chronic conditions of the foot and ankle, and is a particular expert in foot and ankle surgery, including acute, chronic, traumatic and degenerative forefoot, midfoot as well as hindfoot conditions. Mr Koç currently practices at Spire Southampton Hospital, Nuffield Health Wessex Hospital and Healthshare Clinic Winchester, while his NHS base is University Hospital Southampton NHS Foundation Trust.   

The highly trained surgeon also possesses a special interest in managing and treating conditions related to the ankle and hindfoot; anywhere from sports injuries to various different degenerative conditions; as well as arch and heel pain. He also has extensive experience in minimally invasive foot surgery.

Mr Koç, who previously was consultant orthopaedic foot and ankle surgeon at Queen Alexandra Hospital in Portsmouth where he was the audit lead for the trauma & orthopaedic department, impressively achieved a distinction upon successful completion of his UK-based specialist medical training at Guy's, King's and St. Thomas' School of Medical Education. The foot and ankle injury specialist's main clinical interests include sports injuries, sports medicine, osteoarthritis, arthroscopy, foot surgery, ankle surgery as well as soft tissue injuries. 

To-date, Mr Koç has published a substantial amount of peer-reviewed medical-related publications and has also won a host of teaching, research excellence and presentation awards. To add to his esteemed medical curriculum, this well-regarded doctor has so too undertaken fellowships at established hospitals such as University Hospital Southampton, Nuffield Orthopaedic Centre in Oxford, Royal Surrey County Hospital, as well as Frimley Park Hospital. 

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Mr Cristian Nita is a highly revered consultant trauma and orthopaedic surgeon who specialises in knee pain, knee surgery, knee injuries, sports injuries, meniscus tears and meniscus repairs, as well as osteotomy. He currently practises at the Nuffield Health Newcastle upon Tyne Hospital. 

Mr Nita, who is also an expert in relation to performing total knee replacements, partial knee replacements, distal femoral osteotomies, cartilage regeneration, as well as knee ligament reconstructions, successfully completed an MBBS and MD in 2003 at the prestigious and renowned Carol Davila Medicine and Pharmacy School in Bucharest, Romania.

He possesses a specialist research interest in young adult joint preservation, correction of deformities through the use of peri-articular osteotomies, as well as outcomes of joint preservation surgery. Notably, Mr Nita undertook a fellowship in lower limb arthroplasty. 

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Professor Hendrik Tobias Arkenau is a prominent medical oncologist in London who specialises in the treatment of gastrointestinal cancer, stomach cancer, liver cancer, pancreatic cancer, bowel cancer and immunotherapies.

He was awarded his medical degree from Hanover Medical School in Germany in 2000. He then completed his specialist training in oncology across numerous centres of excellence, including the Royal Marsden Hospital. He was awarded a Fellowship by the Royal College of Physicians and he plays a crucial role in his field of gastrointestinal cancers, drug development and immunotherapy thanks to his research contributions.

Professor Arkenau is the founding Medical Director of the Sarah Cannon Research Institute UK and he is currently the Executive Medical Director for the institute. He is a chief and principal investigator of numerous clinical trials of new anti-cancer drugs, including immunotherapies and cellular therapies.

He is a professional research associate at the University College London Hospital. Throughout his career, he has published numerous peer-reviewed articles and book chapters and regularly contributes at international and national meetings.

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Dr Mohan Gondhalekar is a highly accomplished and dedicated consultant old age and general adult psychiatrist based in London. Dr Gondhalekar specialises in a wide range of areas including adult ADHD, anxiety, adjustment disorder, PTSD, OCD, panic attacks, personality disorders, memory disorders, psychosis, bipolar affective disorder, and depression.
 
Dr Gondhalekar undertook his medical studies at the University of Birmingham, graduating with a Bachelor of Medicine and Bachelor of Surgery (MBChB) in 2011, following his Intercalated Degree in Bachelor of Biomedical Sciences (BMedSci, History of Medicine) which he received from the same institution in 2009. He later became a member of the prestigious Royal College of Psychiatrists (MRCPsych) in 2016.
 
Dr Gondhalekar underwent postgraduate core psychiatry and dual higher specialist training at the Herefordshire and Worcestershire Health and Care NHS Trust, as well as the Essex University Partnership NHS Trust. He currently holds the position of consultant psychiatrist at the North-East London Foundation NHS Trust within Community Old Age Psychiatry, where his expertise has positively impacted countless patients.
 
Beyond clinical practice, Dr Gondhalekar actively contributes to the field by teaching, working to shape the minds of future psychiatrists. He served as an academic tutor at the University of Birmingham, School of Medicine, and was involved in supervising medical students in their 3rd, 4th, and 5th years. His dedication to mental health extends to positions in public organisations, where he currently serves as an external clinical advisor for mental health at the Parliamentary Health Service Ombudsmen and as a member of the National ECT Accreditation Committee.

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Mr David Cloke is a highly skilled consultant orthopaedic surgeon based in Newcastle-upon-Tyne who specialises in the treatment and management of rotator cuff problems, shoulder instability, shoulder arthritis and elbow arthritis. With more than 25 years of experience, he is an expert in the full range of upper limb surgery, including shoulder replacement and elbow replacement procedures, of which he has performed more than twice the national average in the last three years. Alongside his NHS work at Northumbria Healthcare, Mr Cloke currently sees patients at Nuffield Health Newcastle-upon-Tyne Hospital and Northumbria Health.

Mr Cloke originally qualified from Newcastle University in 1997 and completed his orthopaedic training in the Northern Eastern Deanery. He became a member of the Royal College of Surgeons of England in 2001 and was named fellow only seven years later. Mr Cloke went on to obtain an MSc in Sports Medicine with distinction from the University of Bath that same year, specialising in sports shoulder conditions, before going on to accomplish a higher surgical training shoulder and elbow fellowship in Sheffield in 2009. Mr Cloke has practised in renowned hospital settings since, balancing his notable trajectory with service as a Lieutenant Colonel in the Army Reserve.

Further to his clinical practice, Mr Cloke is a recognised figure in medical education and training. He sits on the Specialty Advisory Committee, which regulates orthopaedic surgical training in the UK, and is a shoulder member at ODEP, the panel responsible for evaluating the safety and the performance of joint replacement implants. Named Northern Orthopaedic Trainer of the Year in 2014, Mr Cloke is also an associate clinical lecturer at Newcastle University and a national FRCS(Tr&Orth) consultant examiner since 2016.

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Mr Oliver Old is a distinguished consultant general surgeon specialising in bariatric surgery and upper gastrointestinal (GI) surgery. He currently practises privately in both Gloucester and Cheltenham. With over 15 years of expertise, he excels in a wide array of procedures including bariatric surgery, gallbladder surgery, hernia repair, acid reflux treatment, and management of Barrett’s oesophagus, demonstrating his commitment to comprehensive patient care and weight loss management.
 
Mr Old has an impressive educational background including an FRCS qualification from the Royal College of Surgeons, an MD from the University of Exeter, a Bachelor of Medicine and Surgery (MBChB) from the University of Birmingham, and a degree in Neuroscience. He was awarded a Research Fellowship from the Royal College of Surgeons focusing on Barrett’s oesophagus, for which he was awarded his MD. He completed his surgical training in the UK, Australia and New Zealand, including fellowships at prestigious centres of excellence in Melbourne and Auckland.
 
In addition to his clinical practice, Mr Old is actively engaged in research. His contributions extend to leadership as the Chief Investigator of the Barrett’s Oesophagus Surveillance Study (BOSS), a large-scale international randomised trial. He is also a member of prestigious professional bodies such as the Association of Upper GI Surgery (AUGIS), the British Obesity and Metabolic Surgery Society (BOMSS), and the Royal College of Surgeons.
 
Mr Oliver Old's dedication extends beyond clinical and academic realms as he has volunteered his expertise and time to various initiatives.

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Mr Jan Herzog is a consultant spinal surgeon with practices in Stanmore, Bushey and Central London who specialises in complex paediatric and adult spinal deformities, including scoliosis and kyphosis. He also has a special interest in degenerative pathologies of the spine, including spinal stenosis, sciatica, lower back pain and disc disease. He is an expert in spinal fusion for neurogenic pain and minimally invasive spinal procedures, and uses spinal navigation regularly.

Mr Herzog performs surgeries at the Royal National Orthopaedic Hospital and currently sees patients at Spire Bushey Hospital and at St John & St Elizabeth Hospital.

Mr Herzog qualified from Humboldt University of Berlin in 2004 and then obtained his MSc in Diagnostic Imaging from Oxford University, before going on to complete his surgical training in trauma and orthopaedics in Germany. He then received a visiting fellowship to Harvard university teaching hospital in Boston and was later appointed trauma and orthopaedic consultant at Charité in Berlin, where he developed his medical interest in spinal surgery. To pursue this speciality, Mr Herzog relocated to the UK, where he accomplished three spinal fellowships: at Frimley Park Hospital, at St George’s and at the Royal National Orthopaedic Hospital.

Further to his spinal surgery practice, Mr Herzog is actively involved in the research of scoliosis, spinal myeloma, and spinal navigation. He is the author of several publications, has lectured both nationally and internationally, and has a special interest in back pain in athletes due to his background in international rowing for Germany (both as an athlete and a national team doctor).

Mr Herzog is on the GMC’s specialist register for trauma and orthopaedic surgery and is a member of the British Scoliosis Society and the Deutsche Wirbelsäulengesellschaft.

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Dr Ravi Ratnavel is a leading consultant dermatologist based on Harley Street, London and in Buckinghamshire. He is renowned for his professional, expert and friendly service. His expertise covers all aspects of dermatology, including skin cancer; hair, skin and nail disorders; acne; difficult rashes; suspicious moles and psoriasis. He also provides a paediatric service for children's rashes and other skin conditions. What's more, he's also highly skilled at performing both surgical and non-surgical skin procedures.

His primary medical education took place at Oxford University, and after his studies, his practical training took place at university hospitals associated with London and Cambridge universities. When it comes to his speciality training in dermatology, Dr Ratnavel has trained at the world-renowned St John's Institute for Dermatology in London. With his first-class training, over 30 years of experience working for the NHS and many years in the private health sector, he has developed expertise that he uses to provide care of the highest quality to all his patients. 

His special interest in skin cancer underpinned his research studies for a doctoral thesis and subsequently was put to clinical use in establishing specialist multi-disciplinary skin cancer services for the Buckinghamshire and Oxford regions, where he acted as the Clinical Lead for several years.

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Dr Ajith Prasad is a leading consultant paediatrician with expertise in allergies. Whilst he has over 25 years of experience treating children for a variety of health issues, he specialises in the diagnosis and treatment of food allergies and intolerances, eczema, and allergic rhinitis.  

In 1997, Dr Prasad completed his MBBS at the University of Kerala, India, where he would later go on to achieve his diploma in childcare in 2000 and his doctor of medicine degree in 2001. He then relocated to the UK to complete specialist training, where he earned himself a membership to the Royal College of Paediatrics and Child Health in 2004.  

In 2020, he obtained a postgraduate certificate in allergy from the University of Southampton. Currently, Dr Prasad holds an NHS consultant position at Epsom and St Helier Trust. He practices privately in Horley, London, and Dorking.  

Dr Prasad has been a fellow of the Royal College of Paediatrics and Child Health since 2020 and holds esteemed memberships to the British Society of Allergy and Clinical Immunology and the European Academy of Allergy and Clinical Immunology.  

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Dr Daniel Jones is a highly regarded, skilled, and qualified consultant nephrologist whose practice includes the whole of kidney medicine. He specialises in acute kidney injury, protein in the urine, blood in the urine, chronic kidney disease, polycystic kidney disease, diabetic nephropathy, and cardiovascular risk modification for kidney patients. His NHS practice is from St George’s Hospital, London and private appointments are currently available at the New Malden Diagnostic Centre in south-west London.

Dr Jones qualified from St George’s Hospital Medical School, London in 1997. During his post graduate training in South London, he received a prestigious Medical Research Council fellowship to undertake research in transplantation immunology leading to the award of a PhD in 2007. Since 2007, he has worked as a Consultant Nephrologist at St George’s University Hospital NHS Trust and held several senior leadership positions during this time.

Over the past 25 years of clinical experience he has focused on improving services and care for patients with kidney diseases and has treated thousands of people. He is currently the joint clinical lead for integration of St George’s and St Helier renal services. He is a fellow of the Royal College of Physicians and the UK Kidney Association.

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