This has turned into a bit of a non starter. Stanley knife no good (or possibly me just being rubbish with it but not the kind of thing to play with). I then found a mini hacksaw in my tool box - no idea when I bought it or why - it still had packaging on so I undid that but couldn't work out how to use it
The blade bit seemed to be the wrong way around and I couldn't work out whether you could take it out and turn it around. Again, I decided that playing with stuff like that was not conducive to holding on to all my body parts. Also, I had shut the cats out of the bedroom but the latch isn't too secure so I was worried they'd come in when there was stuff lying about. So now I have put an ad on our intranet noticeboard at work asking if anyone can do it for me. For someone with a little workshop in the garage and all the right tools, it would be a very quick and easy job I'm sure. Sadly no response as yet. Don't know what I will do if that draws a blank. Are there places that do things like that for you? Sonewhere I can take it? I know I could try to hire a handyman or something but I don't have the space really so need someone to do it in their own workshop or whatever. I don't mind paying a few quid to get someone to do it.
I'm surprised no-one's cottoned onto this gap in the litter tray market - customised litter trays. I'm sure there'd be a demand for someone who had standard litter tray sizes and then cut them to the shape required. So many of us have cats who have let's just say "interesting" litter tray habits!