Bird in Shiba Koen

There was a time, long ago when I was at primary school, when I could probably tell you what type of bird this was. I had an RSPB book of birds (which I think I got by saving peanut butter labels) that I spent hours poring over, though I eventually lost interest. Last week when I saw this walking through Shiba Koen its colour caught my eye, but that was about all.