The GP says there isn't necessarily proof that t3 does anything more than t4 does, and that it will cost the surgery over £60 per month plus the cost of the more expensive testing required.
He has agreed to write one script, which will bring us up to my next endo appointment. Up to now the GP has acquiesced to the endo but who wants to bet that one day I will show up for my script and they will tell me they're not giving me any more - ?
I will continue to buy my own t3 (I've had a private script since April and my t3 is costing me less than £10 per month) because it has allowed me to feel virtually normal (I lost 1.5 stones and started running again), which a couple of years of t4 has never done.