There's a new sperm donor forum about, mostly with users from the USA but we would really love to get some members from the UK. The functionality is similar to this forum except this is a world-wide forum, broken down into regions, where members can message each other regardless of whether they are in the same country, or overseas. This can help you dramatically expand your potential donors and recipients. It is 100% free to join. Please feel free to come check it out.
Sperm Donor Forums