I woud've added this:
https://www.amazon.com/dp/B07FPTS12C/ref=emc_b_5_t
but it's already discontinued. I bought one of these at the beginning of the year to do backs of chisels. It has enough tension, enough power and runs fast enough to actually use ceramic belts, it's direct drive, and has enough power to use a coarse belt and make knife or tool handles and I've had it running for an hour straight. There's still a 4x36 with 6 disc version (I bought the one with 8 - but don't have a use for the disc and the sheet metal over the disc from shipping is still on it. It actually had decent dust collection for a vac hookup (like fein size hookup - not exactly pentz approved, but caught most dust.
The rest is a joke, but a person using the platen will never care about that, and the platen is graphite and smooth/slick, replaceable.
I'd guess the 6" disc version will be replaced - shockingly good for the equivalent of $220 with shipping ($170 for the 6 disc version).
Figure it's probably not available in the UK and I don't know what one would do with this kind of thing for woodworking, it's more of a supplemental tool for woodworking and knife making - but a good one that uses a cheap common belt size.
discontinued for a replacement that uses the same design of belt and idler that the cheap over under belt drive sanders do, $100 more and the reviews say after 20 minutes, the new version overheats.
The one I have draws 625 watts under load, which doesn't sound like much, but with direct drive, it's enough as the belt speed could need (you can't stall it without overheating whatever you're grinding).