Just heard back from the vets again and Tilly's x-rays show that her bowels are generally inflamed. So she might have inflamatory Bowel disease (finally someting I can spell!!!

) and they are going to try her on a special diet as it is usually caused by an allegery to something the cat eats. She is being kept in for a few more days just to make sure and to see how she does on the new diet. The only way to get a definate answer is to open her up and to do a biopsy. So she is fine for the moment and I might go and see her tomorrow.
Sally