Hi GSLOW,
I have had UC since 2001 and have an unrestricted class one as a current airline captain.
The only restriction for me over the years has been a grounding whilst on steroids and for three months thereafter.
Speak to the medical department at the CAA, they are very helpful. I wouldn't forsee any problems as long as you are not on a regular and fairly high maintenance dose of prednisolone. They are a very effective drug, however, they do come with some rather unpleasant side effects.
Al the best.