Inspecting a woodpecker hole

Can you spot the woodpecker hole?

I got up onto a friends shoulders to take this photo right into the hole. It was probably made by a greater spotted woodpecker or a green woodpecker which are both quite common in Britain, but always fairly spectacular to see. You can just see where it opens onto a rotten cavity above. This is an ideal bat roost. I knew about this hole in 2008 but the feathers around the rim indicate it was used this year for nesting, possibly by a smaller bird like a blue tit.