I've been hoping to find another nest this year but despite hearing the adults call to the young and the young birds responding and standing for ages beneath the tree where the sounds came from I've not caught sight of them. Until this afternoon.
To make it easy, the young bird (or possibly birds) kept sticking its head out of the hole in anticipation of being fed. It has a bright red head and I suspect won't be staying in the hole for much longer.
The pictures aren't great because the hole was quite high up and difficult to see between the branches and leaves, but you get the idea. I'll see if I can get some better ones tomorrow.