The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Weight Loss Clinics in London: NHS and Private Options
If you're searching for a weight loss clinic in London, you have several options available through both the NHS and private providers. London has access to specialist tier 3 and tier 4 weight management services through the NHS, as well as private clinics offering prescription weight loss medications like Mounjaro and Wegovy. Understanding what's available, how to access these services, and what to expect can help you choose the right approach for your weight management journey in the capital.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
NHS Weight Loss Services in London
The NHS in London provides weight management support through a tiered approach. Tier 1 includes self-help resources and community programmes you can access through your GP. Tier 2 offers primary care-based interventions with behaviour change support. Tier 3 is specialist multidisciplinary weight management — this is where prescription weight loss medications like Mounjaro (tirzepatide) and Wegovy (semaglutide) are typically prescribed following clinical assessment.
To access NHS weight loss services in London, start by speaking with your GP, who can refer you to your local Integrated Care Board's (ICB) weight management pathway. London ICBs include North Central and East London, North West London, South East London, and South West London — each manages its own specialist services. Waiting times vary by area and can range from several weeks to several months, depending on demand and capacity.
Tier 4 services offer bariatric surgery assessment for those with severe obesity (typically BMI 40+) or BMI 35+ with significant weight-related health conditions.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Private Weight Loss Clinics in London
Private weight loss clinics in London offer faster access to prescription medications and consultations without NHS waiting lists. Many private clinics provide online consultations followed by prescription of GLP-1 weight loss medications like Wegovy or dual GIP/GLP-1 injections like Mounjaro. Private treatment typically involves an initial clinical assessment by a UK-licensed prescriber, then ongoing prescription and support.
Private clinic costs vary — expect to pay between £129–£320 monthly depending on the medication dose and provider. Some London clinics also offer additional support like dietitian consultations, fitness coaching, or progress tracking. Research clinics carefully and ensure any provider is registered with the General Pharmaceutical Council (GPhC) if offering online prescribing.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
How do I access weight loss medication through the NHS in London?
Contact your GP and ask for a referral to your local weight management service (tier 3). Your GP will assess your eligibility based on BMI and weight-related health conditions, then refer you to your ICB's specialist team. NHS weight loss medications are typically prescribed through these specialist clinics following clinical assessment.
What weight loss medications are available in London clinics?
Both NHS and private clinics in London offer Mounjaro (tirzepatide) and Wegovy (semaglutide) for eligible adults. Mounjaro is a dual GIP/GLP-1 injection, while Wegovy is a GLP-1 injection. Clinical trials showed average weight loss of 15–21% with Mounjaro and approximately 15% with Wegovy, though individual results vary significantly.
How long is the NHS waiting list for weight loss clinics in London?
Waiting times vary by London ICB. Some areas have waiting lists of 8–12 weeks, while others may be 6+ months depending on demand. Contact your GP practice to ask about current waiting times for your specific area. Private clinics typically offer faster access but require payment.
Can I get weight loss injections like Wegovy privately in London?
Yes. Many private clinics in London offer GLP-1 weight loss injections following an online or in-person clinical assessment. You'll need a prescription from a UK-licensed prescriber. Private treatment is not available through the NHS except in specialist tier 3 services, and comes at a monthly cost.
What's the difference between a weight loss clinic and my GP?
Your GP can refer you to specialist weight management services but may not prescribe weight loss medications directly. Specialist clinics have dietitians, weight management nurses, and consultants who can prescribe medications, monitor progress, and provide behaviour change support. The NHS weight loss clinic pathway is more comprehensive than GP-only support.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.