I had UC and eventually transferred my care to Oxford after unsatisfactory care locally.
I saw Dr. Simon Travis, a consultant gastroenterologist who was personable and got things moving. Eventually, I had my colon removed. The surgery was done by Mr. Bruce George, not exactly a bundle of laughs, but my operation was very successful :)
I had my op at short notice at the John Radcliffe Hospital where the nursing care was generally pretty abysmal, I'm afraid to say. After about a week, I was transferred to the specialist gastro ward at the Churchill Hospital, also in Oxford, where the care and general vibe was superb. I missed out on being there from the start only because my health was deteriorating too badly to wait for my appointed date for surgery.
Check out their websites perhaps.
I fear NHS experiences can be terribly variable, but be a squeaky hinge 'cause they're the ones that get oiled.
Good luck :)