I'm a West Country boy myself. Ooh arr.

Well, you're lucky you're near Exeter because that's one of the best clinics in the country. They're very much patient-led, so they won't rush you into anything... but more importantly, they won't make you wait ridiculously long periods for treatment once you've made up your mind about what you want to do.
The Exeter NHS clinic is The Laurels, 11-15 Dix's Field, Exeter EX1 1QA, Telephone: 01392 677077. They're very friendly and I'm sure they'd be happy to take your call if you wanted to make a general enquiry. You do need a referral from your GP if you want to be treated there, but they're very easy-going and generous with their time.
Waiting times for a first appointment at The Laurels are currently between 3-6 months, after which you have three assessments with a Gender Therapist who will ask you about your life, your history, how you feel now, where you would like to go in the future. This assessment is to determine whether you have Gender Dysphoria, but more importantly it is to help you figure out what (if anything) you need to do. After they've completed the assessment they'll discuss treatment options with you (if appropriate) but crucially, you won't have to undertake any treatment if you're not ready for it. So for example, if they find you do have GD but you choose not to undergo treatment right now because of any complications in your personal life, they'll allow you to defer your treatment until you're ready. If you do decide to go see them, you'll be surprised at how relaxed an atmosphere they have, and how friendly the staff and patients are.
The Laurels advertise in their reception some patient support groups that (I believe) have been set up by previous and current patients, including at least one Facebook group I know of. Why not give them a ring and ask them for the details of any local support groups?
They also suggest ringing the LGBT Helpline, 0800 612 3010, or if you would prefer to make your initial contact by email, try
helpline@intercomtrust.org.uk - this is an Exeter-based confidential helpline and advocacy service that should hopefully be able to give you information about local support in the South West.
You could also try the LGBT Collective, which is a central point for info on LGBT groups & projects throughout the South West. 01392 201012 or email
admin@lgbtcollective.org.ukGood luck.