Thanks Tenchicks,
well Georgina died not long after my last post - she had the most terrible spams and it was truly awful. The reason I wasn't sure about Marek's disease is that both girls eyes looked absolutely perfect. To add to my woes, I noticed another of my girls had a messy bottom this evening. I gave her a bath and two terrible things happened, one I realised she is going blind, again her eyes look perfect. Two, she had a terrible wound by her vent that was crawling with maggots. I cannot believe I allowed this to happen. We washed her and I covered the wound with an antiseptic cream which made the worms crawl out and we picked them all out with tweezers - the worst job I have ever had to do. I then washed the other four girls and checked them out but thank god they were clear - I have cut the feathers around all their vents to be on the safe side. I had already checked all the things you suggested and cannot find anything obvious. I am bordering on the obsessive about my girls and spend so much time with them - with a third girl going blind I think it has to be Marek's. And your question reminded me that I was at a "petting farm" about 3 weeks ago were there lots of free range poultry - I wonder if I picked it up there? Well I'll definitely have an autopsy done as I need to know what it is I'm dealing with and won't get any more hens til I know it's safe.
Thanks again,