Late, late swifts - NOT amateur radio

Quite unexpectedly, a couple of swifts were seen in the sky above us as we ate tea in the garden this evening. Also, some young swallows were seen, but usually these are around for few more weeks, whereas most swifts have already gone south.

It would not (now) entirely surprise me to see swifts in early September. A few weeks ago I'd have said impossible.