Tray has arrived. I'd say they've been a bit out with the measurements. I've got the tape measure out and it isn't 25cm high at the sides. It's probably about 23.5 which might sound like splitting hairs but given I could really do with it being more than 25cm I'm a bit peeved. Still, I'll give it a go as it is higher around the front than the existing one so it might just keep the litter contained. The other dimensions are obviously refer to the outside of the tray, including rims etc. so the inside is a fair bit smaller than I was expecting. I am a little disappointed with it tbh and am a bit reluctant to swap the bath sized tray they currently have, and are happy with, for this one. But it's still a good sized tray so I think I will try it. Besides, doing a return would probably be more trouble than it's worth. I've put it in a cupboard for now and will get it out at the weekend to swap over.
It's also cream not beige but I was expecting that as I'd read in reviews it was more cream but I'm happy with that colour.
sigh - started this post some time ago then Kito disconnected my wireless broadband. I'm never having a laptop again. cats and laptops is just not a good combination.