I have blue tits (fnar fnar!)

For the past 4 springs, I've had blue tits nesting in my kitchen wall. When I had an old boiler removed, a pipe left a small hole to the outside that's way too high up for me to fill it unless we've got scaffolding up so it was left. And a bluetit family have moved in each spring.

I have blocked off the hole from the next back into the house with a piece of clear plastic so that I can peer through and see the chicks occasionally.