Terri - the stuff in the litter box is definitely not foamy or white urine, it was like something has been deposited, dry, on top of the patch of litter that is damp with urine. It looks almost as if someone has put a large spoonful of fine wood shavings, or grated cheese, (sounds weird but that's all I can think to describe it!) Nobody has touched the box, so it is just from the cat. No other animals, and no insects around (we are in Scotland, cold winter still!)

She drinks water daily, so not dehydrated. Could it be something passed as faeces, and I have thought it to be the top of a patch of urine in the litter because it was damp or watery when passed? My husband thinks it looks almost like stuff from a wasp nest - it is also soft and flakes apart, not crystalline.

Terri - not in her litter box, but she is in and out all day and only uses it at night if she needs to. (She went in it the night before, and was fine) I have also checked her out, and her bottom is clean, doesn't have anything on her fur. A mystery! Not seen anything

like it with any cat we ever had!

I wonder now if that could be that she passed water followed by this stuff, which is why it is confusing. Maybe we should keep her in so she has to use her box, just to check when she goes again?

Thanks Terri - will just keep checking her box and try and follow her when she goes out to the garden!

I will let you know if anything further develops, many thanks for your time.