What I found Steve, the guys name is Daniel, no number or contact, but all ads using same format and coming from Coleraine, coleraineparts1, 2, and 3 is my dealings, also in own name on gumtreegum tree, but found others qualitycparts1, 2 and 3, using same format and what looked like same vehicles in scrap yard.
I tried to do a check on dismantlers in Coleraine, and the only one that came up was Higgins car dismantlers, had a massive fire not too long ago 156 vehicles.
They may all be totally separate or all one and the same, the fact there was so much stuff supposedly in one area from all those 'different' people, further fuelled my suspicions about the whole lot.
As you have full name address and contact number of the guy, sounds believeable, but anyone having different user names and from that area and does not appear in the name registered in that town, gets a miss from me now.
I was looking for 120 lc3 parts at the time I came across loads of the ads and there are still some running except the ones with shit feedback, including mine.
As It happens I can turn the situation around with what I have, so am not totally out of pocket, but had I sent stuff back at my cost, I doubt if I would have seen goods or refund.
Good luck mate, sorry I couldn't be more definate