Thanks SO much for replying! My OH is getting so peed off (pun intended!) he's mentioned getting a different cat, as if that's an option! He's not a cat person (yet..... though she's not helping!)
The doormat is built in so while it can be removed, there's bare concrete under it so it would have to be recovered with either a different door mat or wooden style floorboards to match the rest of the house - a big job if she's just going to pee on it again so a bit of a last resort.
We've just moved in so I have no idea whether it's coconut fibre. I've just had a quick google and i think it is rubber or pvc backed coir 'cos it looks most like this
She hasn't been neutered yet - i'm praying that'll cure it!
I've read a few of the stickies here about spraying and i'm not sure she is because she's squatting? I think it says they don't squat when they spray? I took her to the vet who said she's a healthy cat but how would she know if she's got a UTI? She didn't look like she did much apart from feeling her body a bit.
Oh, we live in a very quiet square with half a dozen houses so there's not much going on outside. I have seen a big cat spraying in our garden but you can't see that from the front door and she doesn't meow or anything when she looks outside.
I might soak it in a bath of bio solution. Where would I get Simple solution from PAH? I've heard i can use surgical spirit which may be easier and cheaper to get hold of.
By the way, she is absolutely determined to pull off any kind of button i happen to have on!! What's the big deal with buttons?! Crazy cat.....