[Kroggers]

Good advice Peppy, but I think this is the small verity that do not migrate in the winter

As stomachmonkey suggests, I will have to get up there and see if I can get to see in enough to assess the situation.

Can birds do long term damage in there?

They woke us up last night scrambling above our heads! Thought it was squirrels at first. Stood outside this afternoon and watched two small birds appear from the gap and fly off - so now i know it is birds and where they are getting in and out at least...