Thanks Freedom for the suggestions and help, i have not had a real good clean yet, just a surface one hoping I would be lucky, the weather is not the best at the moment,for hanging out bedding, and i have wall to wall carpet i am afraid, and it is not on the beds for sure but could be on the valance i guess, but it does not appear to be there at all, seems particularly in the corner where the litter tray is, although it is hard to tell at times, because the whole room has the odour, but mostly in that corner.

Anyhow i will endeavour to find out where it is, and clean it up, as i cannot bear the smell,geez cats pee stinks doesn't it? i just had a big sniff now and boy oh boy it is bad alright, once you are in the room for a while you nose does not smell it quite as bad, but on entering the room or sniffing you sure can smell it yuck,nawtee kitties.