I just wanted to post a massive thank you to everyone for their advice. I had a hen with rectal prolapse, following a bout of diarrhoea just before New Year. The hen (called Star), has been well & her usual self throughout this whole incident & am so glad that she is well again, and we have not had to cull. I followed various advice that has been posted & this is what worked for us; Bathed the hen, trimmed all her rear feathers, as these were full of poop & kept her in a warm dark quiet box overnight, making sure she was nice & dry as it's winter here, before popping her back in a pen on her own. Put pile cream on her backside & gently pushed the prolapse back in. Repeated this process every 2-3 days for about 2 weeks. Swapped to honey which seemed to work better - I don't think that this made the swelling go down, but I think it acts like a barrier, and stops any infection. Gradually she has gone on to weekly baths - just to keep her clean. We will still be keeping an eye on her - but this fab advice was what helped us get through it - and I'm very grateful to everyone for their help!