Definitely an agile robin: he was singing his heart out, high in the tree, when I arrived; I took half a dozen shots and when I left, he was still singing away, although he did look a bit precarious.
A small and belated September update for 2024, where I am still, after many years' membership, on 365 Project, also now posting elsewhere but wanting...
Yes, I've only learnt, through 365, that robins are different in different countries.
I think that is called 'Sod's law'?! This was the most amazingly co-operative robin - he just sat and sat and sang and sang.