Pretty good service but I was worried about doing this sort of thing by post so ended up going to the local GUM clinic. Turned out that the results that The STI Clinic gave me were correct so I need not have bothered having it checked by the NHS. The service should be free - that is my only complaint.

Very good service from this clinic. Saves a lot of embarrassment and the results came through quickly. They offer treatments if you need them as well so it is a lot better than some of the online services that leave you hanging if you have a positive result.