The trans community is really quite small, and organisations are as good or as bad as the sometimes very small number of people involved in keeping them going. There are some dedicated people out there. Here are a few links…
The Gender Trust ‘supporting all those affected by gender identity issues’. They have a telephone helpline too.
GIRES ‘information for trans people, their families and the professionals who care for them’
Trans Media Watch a relative newcomer, and one to watch.
Press For Change a campaigning organisation. Their website has a lot of information about the legal aspects of being trans.
Charing Cross GIC the Gender Identity Clinic at Hammersmith. This is their new website, and it has lots of useful info, including links.