Yes, I thought that at the time re Swanlake. The day started off very well when we saw a pair of mute swans that had teamed up with an African crane that had been blown off course.
My recent observations were 3 or possibly 4 sparrowhawks yesterday afternoon, flying high over the park. A couple of them started off lower, but by the end they were having a great time about 500' up - at least, that's my guess for how high a sparrowhawk has to be before you aren't sure if you can still see it, and then a tiny dot appears again.
This morning, I saw 8 swifts at rooftop level, so they are still here. I expect they will be around for another week or so; another sparrowhawk, this time at tree top level, and a greater spotted woodpecker. I was just thinking that it was quite some time since I'd seen a green woodpecker in the park when one appeared from some gardens to my left and flew into the park. This was all on my pre-breakfast walk - I got 3 miles in before 8.45.