Santa:
Back in the day when I was an agency limper, I was delivering into Sainsbury’s Feltham. A left-■■■■■■ came in and after watching him make a ■■■’s ear of reversing twice, it dawned on me that his rear-steer wasn’t locking. As a well-equipped agency wallah, I had a bolt in my bag for just that eventuality, so I hopped out and after a bit of a pantomime, with him no spika da english, I crawled under his trailer, popped the bolt in and - voila. My good deed for the day.I had a full load and he must have only had a couple of pallets because in no time at all he was tipped and pulling off the bay. I expected him to return my bolt with grateful thanks, but the so-and-so just drove off with it still in place.
Still - bolts are easy to come by and a few weeks later I did the same for a Turk at a Booker’s depot. He didn’t speak much English, but he did know please and thank you, and how to work the coffee machine in the office.
So that’s where the phrase comes from…
He just bolted… 
I’ll get my coat…