Hey [emoji5], welcome. To answer your question, I don't believe Dr Webberley can give a letter, she is simply providing private bridging prescriptions. Clearance for surgery in the UK the can only come via either an NHS GIC or one of the two private GIC services in London. You don't say if you've started your RLE yet, but my understanding is that WPATH requires 1 year full-time before surgery referral, the NHS route is often longer...
If you can fund it, talking with a trained therapist can be useful in working through any thoughts or feelings you may have, but in the UK, therapists have no direct power to clear you for HRT or any surgery. Good luck. X
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