If they don't do the Pill Cam in the UK, what about
a CT Enterography? Or maybe even a Nuclear White Blood Cell Scan? They used to use Ceretec but maybe have something better for the nuclear WBC scan, Indium maybe? At least it will detect inflammation in the small intestine and where.
I'm also the only one to have have Crohn's or any related type disorder in my family and I'm "into" genealogy and buy the death certificates (giving cause of death) and so am pretty darn sure I haven't missed any one who might have had it. I haven't found anyone who has had ANY type of intestinal disorder or problems in our family on either side.