Welcome! I am very similar to you in that most all of my friends and family know I'm trans, but I haven't presented to them in a female way. I'm soon to be 61 and as of a couple of weeks ago I no longer call the San Francisco Bay Area my home. I bought and loaded up a smallish RV and am now traveling north in Oregon, exploring my trans-ness (for lack of a better term) and considering where I should relocate more permanently.
I don't think I will need/want to transition but I have plans to visit a service in Portland that offers more complete make-overs, consultations, and outings, for three days straight. I think of this as like "training wheels" for a bicycle - although I don't know if you have the same things in the UK. Of course, children want to fully learn how to ride a bike and honestly, I'm not sure how much this experience will make up my mind. But instead of just thinking about it (and all the things that might go wrong or right) it's important to actually experience life. Yes, it's scary but that's what I'm paying them for, to help me.
I will say that in some ways I envy those who know they must transition. I guess it's like knowing what career or education one must have. The lack of certainty about where I am under the transgender umbrella leads to a fair amount of stress and wonder. Perhaps you've achieved a level of comfort with all that? If so I applaud you and would love to hear how you figured yourself out.
Again, welcome, and I look forward to hearing from you!