It’s a minefield and make no mistake, I’ve only ever part ex’d vans and dealers can be outright crooks, I was attempting to part ex a van in August (I’d had the van hab checked FOUR days earlier, clean bill of health with NO damp anywhere, book stamped by recognised and affiliated company.) lo and behold the dealer found damp, I told them FRO and called them liars to their face. Just beware there are thieves out there.
I’ve heard good things about MHD to be fair, they seem to be held in high regard.
Good luck.