Went out to the park with my Fuji S5700 and bribes again - and got one very bold squirrel who came within a couple of feet before he got skittish:
While I was there I tried bribing some other park denizens - it turns out that they are also suckers for fruit and nuts:
I've been seeing occasional parakeets for the last couple of years, there's been a bit of a population explosion, but at one point there were about twenty in view, and I had one on my head, two on my arms, and another on my shoulder.
It's interesting that the two animals that interest me most in the park are both invasive non-native species - the squirrels in London are the North American species, Britain's native squirrels are now VERY rare and only seen in Scotland.