Well I have now realised that I have at least one old litter tray in a cupboard that I'd forgotten about. It's not high backed like I want, but it is quite a deep tray (base of a covered tray) so I will use that to start with. I can then replace it with a high back one when the time comes. I don't even know if he is going to use it yet so daft spending money I don't have on a new tray. I had totally forgotten that I rarely throw away old trays - I usually wash them and put them away somewhere for some future emergency! I am going to try and sort out the bathroom this weekend and get the new tray installed.
I looked in PAH today and all the trays were way too small for Jaffa. They must assume all cats are small
I quite liked the pet boutique ones but they were a bit small and the plastic was very thin. If they'd been a bit stronger and a bit larger, I might have got a black one (no way would I get Jaffa a pink one!). I think purrsonal touch might be the place to go and they tend to do most of the cat shows so when I'm looking for a replacement, I might be able to get one from a show (maybe the next Supreme).