I too would be wary of scams, a potential buyer asking a few questions for clarity before travelling is reasonable. But his actions don't seem right to me, so ignoring him as a buyer sounds like you did right thing. I recently sold a car through motorway, worked well, they sent someone to collect few days later, got offer £250 below their initial estimate, but was still £800 more than best px offer (and £1800 more than another offer). However when they came weren't happy that it had the original tyres on, 7 years old, as said would need to put new ones on to resell it, wanted to take about £270 off, but as they were in the photographs we agreed to meet in between as wasn't worth sending them away as still about £650 better than best alternative offer. For the record I checked the buyers website afterwards, went on their forecourt couple of days later, they sold it about 2 weeks later making about £2300 if they got full asking price.