Nice surprise!

During a break at the allotment this afternoon, I went to check the 'Nature area'. I was initially looking for Blackcaps, but this up in a tree was a very nice surprise instead:

I had been looking for some elsewhere in the park without luck so far, in relatively quieter parts, by the Thames, but this is so close to one of West London's busiest roads, Fulham Palace Road, it surprised me.
A pity the light was terrible and the angles difficult...