These people offer a wonderful service - I get tested once a year. It free though they do ask for a donation.These are a good link
PSA Testing & Events - PCaSO
PSA Testing When and Where Each test event takes much planning and organisation so we limit the numbers our volunteers undertake and keep our activities within Dorset, Hampshire and Sussex. Dates are usually, but not exclusively, in Spring and Autumn. The Sussex and Hampshire Branches of PCaSO...pcaso.org