Advice about blood testing for GAHT in the UK

Anyone in the UK on HRT and getting blood tests? I am going through the onboarding process for GAHT via Imago.tg.

Imago provide the full list of tests I need to take, but I can only contact my GP via their online intake forms. They do provide a space to ask for a nurse appointment for a blood test, but I'm a little cagey about outing myself to them if they will not actually help me. They don't have a way for me to just ask "can i see my GP" so i can talk to them in person.

As for private options, i only seem to see the off-the-shelf stuff at superdrug and the like, and none of their off-the-shelf offerings have the range of tests I need in them.

I'd love some advice from someone in the UK who's going through this process.