Yes it is lovely to be able to help out.

sounds like A4A is full of fledgling savers!
Pauline I love the bucket idea, I'll save that idea for the future. It was lucky Martin was well advanced, and I'm not sure how long he would have lasted sitting on the patio.
I did find a crashed nest a couple of years ago, again House Martins. I found the little fledgelings almost dead with cold, no sign of parents. Following advice from a nearby rescue centre I took the little chicks to them, where they were looked after and then released. They said HM nests quite often come down when a period of rain follows a dry time.