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Guide

STI testing in London: where to go and what to expect

Where to get a free, confidential STI test in London, how home kits work, and what to do after a risk.

Last checked October 2026

STI testing in London is free and confidential. You can go to an NHS sexual health clinic without a referral from a GP, and if you live in London you can order a free test kit online to use at home. This guide explains how both work, what a test covers and what to do after unprotected sex. It is written for people who see escorts or have more than one partner, and for the escorts themselves.

Where to get tested

  • NHS sexual health clinics. You can walk in or book, you do not need a GP referral, and care is confidential. Central London clinics include 56 Dean Street in Soho, the Mortimer Market Centre in Bloomsbury and the Burrell Street Clinic in Southwark, and there are many others across London.
  • Free home kits. Sexual Health London, at shl.uk, runs a free online service for people who live in London. You register, complete an online consultation, receive a kit by post, send your samples back and get your results by text or email.

If you are visiting London you can still use a walk in clinic. Sexual health services in England are open to everyone.

What a test covers

A standard screen usually covers chlamydia, gonorrhoea, syphilis and HIV, using a urine sample, swabs and a blood test. Ask about hepatitis B and C if you may be at risk. Some infections take weeks to show on a test, so the clinic will tell you when to test and when to retest.

When to test

  • After a new partner, or after sex without a condom.
  • Regularly if you have more than one partner. A clinic will advise how often.
  • If you have symptoms, such as discharge, pain, sores or irritation. Do not wait.

After a risk

PEP, post exposure prophylaxis, can stop an HIV infection after a risk, but it must be started within 72 hours, and sooner is better. It is free from sexual health clinics and from A&E. Emergency contraception is available from pharmacies, GPs and sexual health clinics. PrEP, which prevents HIV, is available free from NHS sexual health clinics in England if you are eligible.

Condoms and escorts

Condoms cut the risk for vaginal and anal sex, and are advised for oral sex too. A listing that offers sex without a condom is offering a risk, and bareback meaning explains why. OWO and CIM carry their own risks.

If a test is positive

Most infections are easy to treat, and HIV is a manageable long term condition. The clinic will explain the treatment, and help you tell recent partners without naming you if you prefer. Clinics do not tell your GP unless you ask them to.

For people who sell sex

The same free, confidential services are open to you, and National Ugly Mugs offers safety tools and support. Safety and help lists the contacts.

Common questions

Is STI testing free in London?

Yes. NHS sexual health clinics are free and confidential with no referral, and Sexual Health London offers free home test kits to people who live in London.

Do I need a GP referral?

No. You can walk in or book a sexual health clinic directly.

What does an STI test cover?

Usually chlamydia, gonorrhoea, syphilis and HIV. Ask about hepatitis B and C if you may be at risk.

What is PEP?

Post exposure prophylaxis, a course of medicine that can stop an HIV infection after a risk. It must be started within 72 hours.

Will my GP be told?

Not unless you ask the clinic to tell them.

Who do I call in an emergency?

999. For a non emergency report, call 101 or report online to your local police force.

18+ For adults only. This site publishes guides, definitions and London market figures. It does not arrange bookings, and it does not speak for anyone.

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