Hello Caz:
Way back in time they only had the NDT's and all was fine. However, as pharmaceuticals companies got into designer drugs made for a special condition like BP, and Epilepsy, and thyroid disease.
These phamaceutical companies have Rep's that go to doctor's offices and tell the doctor plus prescribe this drug. They Lobby the doctors and in some cases under your countries formulary get to be the "ONLY ONE".
I once went into an Endo's office and everything was "Compliments of Synthroid" (LEVO in USA), posters on the thyroid, coffee table, mugs, display items, & even right down to the liner on the exam table!!!
Back in the day, they would give the doctor perks for prescribing the med. They would give trips and money and dinners etc....not so much now but they give the doctor items for their office.
It has to do with money mostly. You scratch my back and I will scratch yours, attitude. Backroom deals made between hospitals and the maker of the drug also.
Now they do it with Diabetic Insulin's also. So it is wide spread and a big business for a drug maker. It is not right, I know. Can you write the head of the UK system a letter? I don't know, worth a try.
In the UK, it is a socialized medicine and you really can't fight them. So some ladies spend their own money to buy what they need to help themselves.
NDT is a fine medication and has been a proven med for more than 100 years. It is good and safe and is not hard to dose at all. Doc's are into doing the easy way out and some are just stuck on a medication and "can't think outside the box."
MD stands for "ME DOCTOR" is an old joke, and unless they have empathy they only will do what they like to do or their hospital says they have to do. Private Doc's are not bound by that.
Regards,
Shelly