Thanks for the suggestions, I think it may have been a Linnet from looking at the rspb site, though the colours aren't quite as vivid as the ones I saw - maybe the juvenile colours are?? The red was similar to that of a Great spotted woodpecker, the juvenile of which has a red cap, but this bird was nowhere near that size and its wings weren't spotted... There are lots of Black redstarts that visit our garden and it definitely wasn't one of them. Sorry should have mentioned I'm based in central France, dept 36, countryside, mainly cattle, so lots of fields growing stuff to feed them! I shall have to keep a lookout for him, try and get a photo.