Hey everybody

So I had my second appointment with Dr Curtis today, he's writing to my GP to say I can start T and told me to go back in 3 months.
If my GP refers me to the NHS, how do I go about changing over from Transhealth? Do I continue seeing Dr Curtis until I have my first appointment? Do I need to provide proof that I will be seeing someone else?
I'm assuming that now my GP has taken over the prescription/blood tests that an NHS GIC can't stop that happening?
The reason for switching is that I have to travel a long way to these follow up appointments in London, a closer GIC is a lot easier.
Sorry if these questions are basic it all just seems super confusing to me