https://www.ebay.co.uk/itm/Student-1-2-Double-Bass-by-Gear4music/173952939520
That's got to be worth a punt, surely. If I had the space I'd be after it.
Thirty quid. The case is probably worth more than that.
https://www.ebay.co.uk/itm/Vintage-Bass-Guitar-and-case/333261131728?hash=item4d97e94fd0:g:x3wAAOSw7qddIiz9
Den sold me a wireless system for not very much. It arrived quickly, well packed (with some added padding which I've sworn not to mention ) and was as advertised. I'd be very happy to deal with him again.
Might be crap, might be a rarity, might be both. Doesn't immediately look appalling.
https://www.ebay.co.uk/itm/Schmucker-Wotan-E-Bass-fur-Liebhaber/173921357101?hash=item287e854d2d:g:YvIAAOSwccFc9BKS
Yamaha TRB 4-string.
IIUC these are fairly uncommon and this seems to be a low-ish start price. Not far from me.
https://www.ebay.co.uk/itm/Bass-Guitar-Yamaha-4-Trb-II-Japan/254245438740?hash=item3b32358514:g:LzYAAOSwlR5c7BG5