TsukiCat,
Firstly, the GIC can't ever say 'no', their input is frankly quite minimal in the whole process, they are there to ensure you are mentally and physically fit to start HRT and/or have GRS should you want it.
Their wait for the initial appointment is ridiculous, but once you're in their system, things tend to move at a reasonable pace along WPATH guidelines.
What many UK people do is use the GenderGP service to get a start on HRT while they wait on the NHS queue, then swap over to their care when they catch up.
In the meantime you can work on voice, mannerisms, fashion/style, hair removal, weight loss (if needed), quitting smoking if you do.
Also, remember that HRT (while a big piece for many) is not the only piece of the puzzle. I went full-time several months before starting HRT, and the benefits mentally were great for me.
Good luck. X
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