The procedure went well, and it seems I had the top Hose-wielder at the helm, as two of the nurses said ' oh yes, he's very experienced'. He reckons it's proctitis (same as 4 years ago) but more extensive, and the coeliac symptoms are confusing things. There was a medical student sitting in, so I could hear the explanation of everything going on; all very calm and thorough.
Biopsies awaited, but nothing else nasty found at the time, and the sedation worked well - more fentanyl than last time! Been given some medication - mesalazine - for the first time, to take for the next month.
Thanks for the kind wishes.