Thanks, jb!
Cambridge? Oxford? Milton Keynes?
I took the picture myself. It is in Amsterdam. I didn't dare to go closer to him, but he was clearly not afraid. He likes the surroundings of bikes it seems and there are LOTS there. So, is the heron common to be as tame in Britain as this one? Sorry ,since I took the pic with my phone, it isn't really a good picture. Pigeons are usually more tame, bold even, but this heron was fun to watch.
Don't see many herons, though I saw one in Cornwall by a canal a few years back. They are rumoured to raid fish ponds.
Last one I saw was feeding in a ditch right in front of HMS Heron ! (shore establishment)