My thanks to Keith for confirming my ID.
A short while ago I was watching the House Sparrows actually forcing the Starlings to vacate the feeders when I happened to notice a different bird on the cables leading to the shed. At first glance I thought it was a Blackcap. Anyway I grabbed the camera which I always leave on multi shot and fired off a few seconds. It wasn't until I looked at the results and checked with my books that what I had seen best fitted the pictures and description of the Lesser Whitethroat. Definitely a first for my garden whatever it was.