And if my Aunt had balls she'd be my Uncle!They have argued that they have a timestamped and dated diagnostic which shows no fault codes from the morning of the sale.
In any case, that's irrelevant. Its faulty now, and after this amount of time the law presumes that fault to be developing or present at the point of sale.
Not that I expected any problems (there were none) but I paid the deposit for my van on my credit card, which meant they're liable for the whole sum in the event of problems so I wouldn't have to put up with bellendery myself.
Make up some posters, park it blocking his entrance and phone the local media to come and interview you. Clearly dickheadery is the only language he understands, so start speaking his language.