At Whitecastle Clinic, all consultations and treatments are delivered personally by Mr Matyas Fehervari, Consultant Upper GI, Bariatric, Laparoscopic, Endoscopic and Robotic Surgeon.
You can book directly for a private consultation, send a message, or request a call-back. All appointments are reviewed promptly, and you will always be seen by Mr Fehervari himself.
If you already know which consultation you need, you can book instantly using the form below
I am a Clinical Psychologist with over 14 years of experience working with people managing long-term physical health conditions and complex medical needs. My specialism is working with those with physical health concerns to support individuals to understand the psychological, behavioural and emotional factors that can affect health and wellbeing.
As part of the bariatric pathway, I meet with individuals prior to surgery for a psychological consultation. This provides an opportunity to think through the changes that surgery will bring, explore readiness, and identify any areas that may need additional support to help people get the best possible outcome from their procedure.
Many people seeking bariatric surgery have had difficult experiences with weight, food, and healthcare over many years. My role is not to judge, but to provide a thoughtful, supportive space to reflect on these experiences and to ensure individuals feel prepared.
This is usually a brief piece of work focused on preparation for surgery, with the option of follow-up support if needed.
I work closely with the surgical team to help ensure patients feel informed, prepared and supported throughout their journey.
Before qualifying as a dietitian, Nona worked as a medical physician in the Former Soviet Union. She then retrained and qualified in 1997 from the University of North London with a BSc Hons in Nutrition and Dietetics. Following her training at the Royal Free Hospital and Hillingdon Hospital, she then gained extensive experience at Northwick Park Hospital where she has been a dietitian since 1999. She has strong working relationship with gastroenterologists, gynaecologists, cardiologists, endocrinologists, care of the elderly and ITU consultants through her work at both the Clementine Churchill and Hendon Hospitals since 2002.
Since 2006, she has worked closely with bariatric surgeons, nurses and Harrow health GPs. Nona is actively involved in interest groups such as nutrition support, obesity, coronary heart disease diabetes, gastrointestinal and ITU. She has produced a number of dietetic resources for The Northwick Park Hospital on subjects such as cardio-protective diet, weight reducing, post bariatric( Gastric band, Sleeve gastrectomy, RYGB), low fibre, low potassium diet, clean diet and for vegetarian patients.
Nona maintains and continues to update her knowledge and expertise in dietetics through regular workshops, study days and courses to ensure that her services are always of high standards. She completed a low FODMAP training at Kings College 2012.
Cardiology (lipid lowering diet)
Diabetes
Weight management
Bariatric surgery
Polycystic ovarian syndrome
Nutrition support (including oral, Enteral and Parental)
Renal and Liver disease
Food intolerances and allergy
Anaemia and vitamin deficiencies
Eating disorders
Stroke
Oncology
Pre and post colorectal and small bowel surgery (ileostomy, colostomy and pouchitis)
Irritable bowel syndrome including dietary treatment using the low FODMAP diet
Coeliac disease (non-coeliac gluten sensitivity)
Inflammatory bowel disease
Crohn’s and ulcerative colitis
Professional Memberships
Health Professions Council (HPC)
British Dietetic Association (BDA)
Freelance Dietitian of the BDA
Gastrointestinal Interest Group
British Obese Surgery Patient Association UK (BOSPA)
Gabriella began her career as a Medical PA over eight years ago and has always been dedicated to providing professional, efficient, and compassionate support to both clinicians and patients.
She founded The White Private Practice in January 2020 with the aim of building a team of like-minded professionals focused on excellence and patient care.
Gabriella works closely with Mr Matyas Fehervari and serves as the first point of contact for all patient enquiries, coordinating appointments, correspondence, and ongoing support throughout each patient’s journey.
Type | Duration | Fee | Notes |
Initial short bariatric consultation | 15 min | £100 | Suitable for initial weight-loss discussion |
Specialist UGI / Hernia consultation | 30 min | £295 | For gallbladder, hernia, reflux, bariatric or endoscopy planning |
Follow-up review | 20 min | £195 | Post-procedure or ongoing care |
Gabriella began her career as a Medical PA over eight years ago and has always been dedicated to providing professional, efficient, and compassionate support to both clinicians and patients.
She founded The White Private Practice in January 2020 with the aim of building a team of like-minded professionals focused on excellence and patient care.
Gabriella works closely with Mr Matyas Fehervari and serves as the first point of contact for all patient enquiries, coordinating appointments, correspondence, and ongoing support throughout each patient’s journey.
King Edward the VII Hospital, Marylebone, London
Operating at this prestigious internationally renowned private hospital with modern robotic surgery, full theatre access, and dedicated bariatric facilities. The hospital has a long-standing reputation for excellence and has historically cared for members of the Royal Family as well as international patients seeking world-class private healthcare.
KIMS Hospital Maidstone
Newnham Court Way, Weavering, Maidstone, ME14 5FT
Kent’s largest independent hospital, equipped for complex laparoscopic and robotic surgery.
Nuffield Health Tunbridge Wells Hospital
Kingswood Road, Tunbridge Wells, TN2 4UL
Comprehensive private hospital with full theatre access and dedicated bariatric facilities.
If you already know which consultation you need, you can book instantly using the form below
Online Booking / Contact Form
Complete our secure online form to request an appointment or send an enquiry directly to the clinic.
For urgent or complex cases, please mention this in your message and we’ll prioritise your booking.
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