Don't buy via Purplebricks, they are notoriously awful. They still accept and welcome offers on properties when a buyer is going through conveyancing. Although, saying that, I know the property buying/selling system is different in Scotland, so not sure if they can get away with that there or not. They're still an awful 'agent' to buy/sell through though generally speaking.
The road noise and pollution will be awful. I personally would not buy it, imagine if you had a child, they step out of the front door and an oncoming lorry swipes them clean out. Not worth the risk.
AVOID!
ETA ok so just looked on streetview and it's not right on A1, so the lorry/vehicle knocking down a child/dog risk isn't quite as I thought, however, I'd still avoid, you'll get so much road noise from the A1 and then the trainline. There are better properties out there.