What is the UK metal detector etiquette when being helped to find something?

I was once following a teenage boy driving an old knackered fiesta way beyond his abilities in the snow. He accelerated away from me in a way that immediately made me say to my passenger, "he's going to crash". 30 seconds later I see headlights spinning around and come around the bend to find it upside down on the roof. He wasn't going very fast, just faster than his limited skills allowed, so he wasn't injured. Mountain rescue turned up randomly a few minutes later but said that the car wasn't up to them. He then looked at me and uttered the naughtiest words a man with a Land Rover can ever hear... "can you winch my car back onto its wheels". You bet I can. I winched that car like no car has ever been winched. It was like a military operation. I had bystanders by this point, one of which was a stunning girl who was in the year below me at school. Not only did I get to use my winch, I also took the opportunity to shoot my shot with the girl and she said yes. We ended up being together for a few years and she's still one of my best mates. All of that sounds made up, but I assure you it isn't.