I would be weary of the seller, as he said he will meet you half way.
Me and another guy at work have been investigating a bloke who swapped 2 transits and £5k for a newer van, turned out to be stolen, and running on false plates anyway, the guy he bought it off met him at a supermarket carpark.
I would reccomend going to the persons house, and also 'accidentaly' go to the neighbours house, and when they say wrong house, ask how long the seller have lived there ( a lot of scammers rent a place for a couple of weeks, then move on!)