On the other hand, you don't really need to see the endo that often. I've had 4 visits to date, and I've been on HRT for 9 months now. Initial consult (left with a script), 6 week, and 3 monthly since.
A GP is able to write you a script, but it really boils down to whether or not your GP is comfortable managing endocrine issues.
Doctors are highly variable - a GP by definition is a jack of all trades, master of none, however, some GPs have particular areas of interest where they can sometimes rival a specialist's level of knowledge, so it really boils down to who's around in your local area.