so sorry to hear of your troubles, can I point out in your confused state after the event you typed the wrong reg details, or the old bag has false plates?
Everyone OK that's the main thing, right? Did it do any damage to the bike?
Also when you pulled off after stopping to check the bike.. anyone could have darted between those parked cars, or the parked cars could have pulled out. They wouldn't have much time to see you as you were in a blind spot mate, so maybe go slower? Stay safe. Nice bike.
so did the scrapyard pay him? I take it both cars were left there, as the mot had expired