If your GP is supportive, there is guidance for them to offer bridging HRT before the GIC, but few GPs are actually prepared to do this, the Transfigurations website may help you find one. Also consider that unless you are clearly living full-time in role before your GIC appointment there will be at minimum 2 appointments with them about 6 months apart before they would consider HRT, so 18-24 months is more likely. Budget allowing, there are the private options of GenderCare as a full private GIC service, or GenderGP who will do HRT as a private service.