I'm sure there's a slot on a BBC radio show about this, but I wondered if there is a stranger who did something to help you that you wish you could thank.
Years ago I was travelling alone by train to meet up with a group of friends. It was in the days when Wembley Stadium was being refurbished and there was a big football match final (I think Liverpool v West Ham or similar) being held in Cardiff, where I had to change trains.
I got off the train, walked along the platform into a huge group of fans, somehow turned around and smacked my forehead so hard into a cast iron pillar that I knocked myself out momentarily. When I came round, an older (60's? Maybe 70's) last was helping me up, sat me on a bench and checked me over and got me onto a train, she even carried my case. She made me promise I'd phone the friends I was meeting, which I did.
I never got a chance to get her name, let alone thank her, as it wasn't her train and she vanished. I spent the weekend with a golf ball sized lump on my forehead but I really appreciated the kindness she showed.
Has anyone ever helped you and you didn't get a chance to thank them?