Currently looking for one for my sister, (unfortunately not a sporty one) autotrader appears to be the only one that you can filter out the cat s or worse from, gumtree, Shpock and eBay they all appear to be from part time dealers trying to turn a buck, not that there’s anything wrong with that, it’s just like swimming with the sharks, trying to find a genuine one is like looking for a needle in a haystack, but I suppose that’s half the fun.
I think Gumtree & Shpock were or still are free so why not advertise there? eBay was a flat fee approximately £15, and trader was about £45ish for a month? It’s been a year or two since I sold one? Trader will do you a free valuation although you might have to sign up, but with yours I’d imagine it’s a particular market so valuations may well differ?