this is the first time I've had an ankle chip (but you're right, there was nothing to say that it was for an ankle, as opposed to a wrist, say). Usually, they come with ties so they fit onto shoe laces - at least then you know where they're supposed to go. Once I had a chip that was embedded in the race number, and didn't need collecting at the end. That really was easy to use, though I don't know how well it would work if it was covered up, as it probably would have been in yesterday's weather.
Nice to see you FB: we also met on my first BHM in 2003, I think, when you and Petal were standing somewhere after the golf course. (If it wasn't you, then it was someone claiming to be you!)