You can order free postal HIV test kits from https://freetesting.hiv/  

What is a home sampling kit? 

Home sampling allows you to self-test at home. After receiving your test kit, you collect a sample of blood from your finger, then post your sample to the laboratory.

A week or so later they will contact you with the result. 

Watch the video here:

Window period 

The HIV test may not detect an infection that was contracted very recently – the test is highly accurate after 4 weeks, and almost 100% accurate after 8 weeks.

If you had unprotected sex in the last 6-8 weeks, it is recommended that you test immediately and also complete a new test in 6 weeks to be sure of your status.