Warning - gross picture alert!!! - sorry guys.
Thank you so much for your reply and the nice welcome. I will try and send photos to you tomorrow when the light is better. The ones attached or all I have right now. Yes I'm in the U.K. The first photo is Maisy's bottom. She is the sickest. The chickens pecked at her around her vent which bled. I removed her, noticed possible gleet so cleaned her up etc and put her in quarantine with the other that has suspected gleet. She was constantly producing white discharge even as I cleaned her. There was a thick yellow coating around and inside the vent which I couldn't get off. There was lots of stuck together white stuff going up inside which no doubt made it difficult to poo. I managed to clean some off but she was covered no matter how long I let her soak in the warm water. . The vent ends started to look black but not sure if this was stuck on discharge that had
The other one called Chiney was the first I spotted and had already been in quarantine a few days. She too had been bleeding from her vent, presume from pecking. I originally though that she had a prolapse but it was a mixure of dried discharge and being swollen. and white discharge. She still had a tiny bit of white discharge not much. She is rather is active, eating ok and drinking. But she does sound a bit chesty and I think its been a couple of weeks like this.
Also at the moment the sickly chicken (Maisy) that hasn't been moving and stood with its eyes shut has gone and hid. Whilst I was cleaning the bedding she went under the back door steps. This leads to a gap between the ground and the floor of our utility room. She has gone too far for me to get her and she isn't going to walk out on her own. I'm worried she is going to die there during the night or get by a fox or something as we do live in the countryside and have seen one not that long since. Not sore what to do. I might try cover it with a sheet or metal mesh. But she is still going to be there during the night. Do chickens go off to die like some animals do?
We have had them since March of this year. We use to have chickens about 9 years ago before my son was born.
B I will do a crop check in the morning and try & check its mouth.
Thanks, I will report back tomorrow, don't think i will sleep well tonight

.
below Maisy - one under our utility
Chiney - chesty but gleet hopefully on its way out.