Hello,
What you could do is go into Vision Express in the Buchanan Galleries in Glasgow to have a routine eye test. They're very thorough and always refer you to an ophthalmologist/contact lens clinic in a hospital if they feel your condition isn't a "typical" one that can be handled by them.
Most high street opticians I've been to for eye tests won't touch you with the proverbial barge pole if they know you have keratoconus, and even less so, I'd say, if you've had grafts...so they will refer you immediately. I think they write to your GP first, though, and the GP arranges the referral. Make sure that you give them the name of a GP who knows you have a history of KC and grafts.
In my experience V Exp in Glasgow has been ultra-efficient in referring, so I'd go for it! I was told that the lens prescriptions for KC were too complex for them, and only the hospital could do them. That's a pretty good definition of "responsible professionalism" for you!
Best of luck and hope you get something sorted out fairly soon.
Lyndsey