Thanks for the replies and encouragement. 
Today is a much better day. She's lively and interested in just about everything. She's eating well but she's very thirsty and the problem with that is if you don't restrict her water, she drinks too much and then starts regurgitating it. The urates are still leaking out of her continually and at the moment I am cleaning her about every 90 minutes with salt water solution. I did wonder if it was vent gleat so I applied some canisten as I mentioned before. I'm not sure if that's made a difference but some of the scabbing is starting to come off. 
I think the biggest issue though, is that she is unable to pass her own poop. She strains a little bit pops out and then it gets sucked back in again. When I clean her she strains a lot and it's at that point that I can help vacate her bowels and get the poop out. The consistency is more like quite solid cat poop, in that it's a tube and is quite dense. Once I have managed to get it out and clear quite a bit out, today for the first time since her operation, her vent has gone in. Undoubtedly it will pop out later, but it's a good start. 
Today has been wet food with quite wet porridge and Emeraid. I gave her a grape which I wish I had videoed, because she went at it like a chicken possessed!  So her appetite is good. I'm not assuming that it's all going to go well, but it does appear to at least be going better than it has done. I think if I can get her pooping herself, things will start to improve significantly. The question is, how?
Thanks again for all the support and encouragement. When you're under pressure and it feels quite hopeless, this forum and the support that you give is incredible and very very helpful.