Try the Gay and Lesbian Health Service in Highgate Hill. If thats a bit far to travel then just call they should be able to put you in touch with some people. Also you could try contacting QAHC I say they definately have some names and numbers, or the Gay and Lesbian Welfare Association. Any of these organisations will be able to put you in touch with GLBTI friendly GPs, as you will need a referral to see a fertility specialist. If its near you, Stonewall Medical Centre in Windsor is GLBTI friendly and has at least some gay and lesbian doctors (I *think* its all G/L drs but I can't be totally sure).

HTH