LauraLiz1982:
Sorry to cause further problems but I now have a letter from the DVLA saying that I can have category C without another medical. They have seen my licence number and looked it up. No kidding. Well I am going to submit my application for category C on the basis of the letter. Good wishes, Laura
Go for it - if they will accept that then that’s extra time and money well saved 
Typical DVLA - make one thing crystal clear then do the opposite !!!