Watching the feeder....

I had a lovely hour watching the feeder today with all the usual suspects turning up. I decided to blip this robin using the feeder. He doesn't manage to balance for long but he does get a few seeds! There was a bird today that I didn't recognise and I have added it in the extra shots to see if any of you can tell me what it is? It was about the size of a large sparrow and it was the longish beak that made it stand out from the finches and the sparrows. I have looked on the RSPB website but I couldn't track it down.