Wow guys, thanks for the flood of advice!
You know - since I got into tiling I've always wanted to own a Rubi, but it seems that my budget unfortunately won't stretch to the one it seems will do everything no questions (TX700). Screwfix has conveniently just reduced the Big Clinker £74.95 (I think in the last couple of days, haha!!), so I'm going to go for that (and sandpaper for the sharp edges!) and the Rubi will have to wait for another project...
I have a small grinder with a diamond wheel, and will use my plasplugs tabletop for the two or three L-shaped cuts I have to do.
Thanks again!!
Matt