I'm sure he'll be seriously offended!
I found them: they were actually where I thought I'd find them, astonishingly. They're
very '80s, and feature awesome but strange systems like Maestro. I vaguely remember their keyboards and I have absolutely no idea what on earth they would have been: they seemed to be made out of very heavy cast iron (edit: this is a slight exaggeration, but only slight: they were some sort of very substantial cast alloy stuff) (painted brown, obviously) and had extremely flat, low-profile keys. I don't think they were unpleasant to use, but they looked odd; and futuristic, at the time: I'm sure I saw the occasional Philips Maestro/P4000/P7000 keyboard on Red Dwarf.
Anyway, I'll scan in some of the offending brochures tomorrow, hopefully. Once I've stopped giggling at the word "Sophomation".