Hi Spiceman,
I am with a really good gastro consultant in Addenbrookes Hospital in Cambridge. He is called Dr Middleton and my GP referred me saying he was really good. He put me on elemental diet when I was initially diagnosed but gave me a choice of treatments at that time of the diet, antibiotics or steroids and explained all the options.
Prior to my diagnosis of Crohns Dr Middleton did gastric emptying tests, bile salts tests (both nuclear medicine), alot of blood tests, gastroscopy (mouth down to upper small bowel) and colonoscopy. It was a combination of these that pointed to crohns even though the initial thought was I had Coeliac disease and it was confirmed with the colonoscopy.
There are other Gastro consultants at Addenbrookes and I have heard VERY good things about them too. There is a Dr Lee and she looked after me during my admission last summer for crohns whilst my own cons was on hols. She was very thorough and left no stone unturned - she was also on call when I was in again in October and remembered me! The whole team of gastro at Addenbrookes listen to their patients Spiceman and thats what I appreciated.
Hope this helps and that you get something sorted soon. If I can be of any further help PM me ok?