Hi Romilly.i.know you posted about letrazole a while ago now ,but I've only just seen your post on here. 

I too struggled at first as I kept getting different brands of letrazole I did some research and found out it's the coating on the tablets  on different brands that is different on each brand. I had one brand called Cippia   it didn't agree with me at all,I could hardly walk it made every muscle and bone ache in my body  so badly . I stopped taking it,I know you say the Accord Brand was one you can't take,but out of all the ones I tried it suited me better than any of the others,we are all differnt and what doesn't suit one ,may suit another. Anyway I struggled to get the Accord Brand every time at first , so I spoke to my pharmacy who asked me to ask my GP to head my prescription  Accord Brand of letrazole only said it would help. So I did exactly that, called my GP   and they changed my prescription so I got  mths supply at a time and headed my prescription Accord Brand only.  Scince then it's been sooo much better,only once scince then have I had another brand in my prescription, I checked it and said I cant take this brand, so they took it back, and text me when they had my prescription in again. I was ok as my GP had allowed me to have one mths prescription, instead of the 2 weeks that they used to prescribe to me before they changed it. It might be worth you talking to your GP and pharmacist, to see if it would work this way for you. I also order my prescription on the NHS app,and always comment can you make sure its the Accord Brand Letrazole, as per usual please.  It works for me,hope it helps you get the brand that suits you .