I’ve run into something similar with my GP, and it seems to come down to the NHS rules around these newer meds being pretty rigid. A lot of practices will only prescribe Mounjaro if your HbA1c is above a set level, and once you’re in range they feel obliged to stop it, even though, like in your case, the numbers are only normal "because" of the treatment. When I queried it, my doctor explained they were following local prescribing guidance rather than making a personal judgment. It might be worth asking them directly if it’s NICE guidance or just a local funding rule, and if there’s scope to be referred to an endocrinologist. I agree it feels different from something like metformin or statins, where nobody would suggest coming off just because your readings are good.