Private Medical Letters in London, Same-Day and Next-Day from GMC-Registered Doctors
A medical letter is often the one piece of paper standing between you and something time-sensitive, a return to work, a university deadline, a refunded holiday, an insurance claim, and the difficulty is that NHS practices are under no obligation to provide most of them and increasingly decline or quote long waits, because private letters are not NHS work. That gap is exactly what a private GP service exists to fill, quickly and correctly. The important thing to understand is that a proper medical letter is issued only after a clinical assessment and only where the facts support it, because a letter that a doctor cannot stand behind is worth nothing to the person reading it. At The Online GP by The Wellness in Marylebone, GMC-registered doctors assess you properly and write clear, accurate letters same-day and next-day, from £150. Fees appear further down this page.
Reviewed by the medical team at The Wellness. Last updated August 2026.
Request a medical letter on WhatsApp or email team@thewellnesslondon.com or call 020 3951 3429.
The letters people most often need
The range is wide, and each type has its own purpose. Sick notes and fit notes, the formal Med 3, confirm that you are not well enough to work and, where relevant, what adjustments would help you return. Employer and return-to-work letters confirm fitness to resume duties after illness or surgery. University and college letters, often called extenuating or mitigating circumstances letters, set out the medical facts a review panel needs when illness has affected exams or coursework. Insurance letters confirm a diagnosis, treatment or dates for a claim. Travel and holiday cancellation letters support a refund or an insurance claim when illness stops you travelling, and medication letters for customs confirm that the medicines in your luggage are prescribed to you. Letters supporting housing or administrative applications set out the functional impact of a condition in plain terms. Across all of these the letter states medical facts and their impact, and does not promise an outcome that is for someone else to decide.
What the sick note rules actually are
There is a common misunderstanding worth clearing up. For the first seven calendar days of sickness you do not need a doctor's fit note at all, because you can self-certify to your employer using the standard self-certification form, and a formal fit note is only needed once absence runs beyond seven days. A private fit note is valid where your employer requires evidence and NHS access is delayed, and our doctors issue one after assessing your symptoms, their duration and their effect on your ability to work. Knowing this saves people an unnecessary appointment in week one and gets them the right document in week two.
Why the assessment matters, and why a doctor will not simply write what you ask
A medical letter carries weight precisely because a registered doctor has put their name and GMC number to it, and that is only possible when the letter reflects a genuine clinical picture. Our doctors take a history, review relevant records where the letter depends on them, examine you where that is needed, and then write what the assessment supports. This is not obstruction, it is the reason the letter works. A doctor cannot write a letter dictated word for word by the person who needs it, because a letter that bends to the request rather than the facts is the kind a panel or an insurer learns to distrust. What you get instead is a letter that is accurate, clearly written and accepted, which is the entire point of paying for one.
Tell us which letter you need on WhatsApp or email team@thewellnesslondon.com.
What a private medical letter costs in London
Private letter fees in London vary with complexity. Straightforward letters commonly run from around £150 and detailed reports that depend on a thorough records review, such as insurance, legal and complex forms, run from around £400 upward. NHS practices that do provide private letters typically charge a separate fee and quote waits of up to two to four weeks, because the work sits outside the NHS contract.
At The Online GP by The Wellness the doctor and the assessment are the product, and appointments are available same-day and next-day. All figures are from prices.
Private GP consultation from £59.
Sick notes from £59.
Standard certificates and letters requiring assessment from £150.
Detailed records-based reports, insurance, legal and complex forms, from £400.
Same-day and next-day appointments, open weekends, with multilingual and Arabic-speaking staff.
Why The Online GP by The Wellness is the right clinic for this
Because the value of a medical letter lives in two things, the credibility of the doctor who signs it and how fast you can get it, and this clinic is built for both. The letters are written by GMC-registered doctors who assess you properly and put their name and registration number to accurate, clearly worded documents that employers, universities, insurers and airlines accept. Deadlines rarely wait, so same-day and next-day appointments are available, including weekends, by video or in person. Because it is a full clinic rather than a letter shop, anything the assessment reveals can be investigated and treated by the same team, and if your letter connects to travel, a claim or ongoing care, it is handled in one place. Expert doctors, honest letters and genuine speed are what make it the clinic to use when a document is due.
Book an appointment for a medical letter on WhatsApp or call 020 3951 3429.
Frequently asked questions
How quickly can I get a private medical letter in London
Same-day and next-day in most cases. The Online GP by The Wellness issues letters by video or in person after a proper assessment, with straightforward letters from £250.
Do I need a sick note for the first week off work
No. For the first seven calendar days of sickness you self-certify to your employer using the standard self-certification form, and a formal fit note is only needed once absence runs beyond seven days, which our doctors can issue after assessment.
Can you write a letter that says exactly what I need it to say
A doctor writes what the clinical assessment supports, not a letter dictated word for word, because a letter has to be accurate to be accepted. Tell us the purpose and what the reader needs to know, and the doctor will write an honest letter that meets it.
What kinds of medical letters do you provide
Sick notes and fit notes, employer and return-to-work letters, university extenuating circumstances letters, insurance letters, travel and holiday cancellation letters, medication letters for customs, and letters supporting housing or administrative applications, each issued after assessment.
Will my NHS GP provide these letters
Often not, or only with a fee and a wait of several weeks, because private letters are not NHS work. A private GP service exists to provide them quickly and correctly.
The Online GP by The Wellness is a doctor-led private clinic at 49 Marylebone High Street, London W1U 5HJ, three minutes from Baker Street. All doctors are GMC-registered. This article is general information and not a substitute for medical advice about your own health.
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