Nesting Nuthatch

I kept hearing bird sounds I didn't recognise, I listened for a while & eventually saw a couple of Nuthatches going in & out this hole way up in the tree. I hope the very cold weather of the last few days hasn't affected them because I think they are nesting. I am struggling to get decent in focus shots with my camera at the moment, it has been fixed twice before but seems the old problem is back!

Done