But which woodpecker? I ran to the computer and called up the RSPB site. There are three woodpeckers found in the UK, the great spotted, the green and the lesser spotted. The great and lesser are quite similar except that the lesser spotted is smaller and has a distinctive red head.
Not only that, but while the great spotted is reasonably common, the lesser spotted is on the red list, ie globally threatened. OMG! Was this a lesser spotted?
I rang up the RSPB London branch (well, I had to tell someone) and agreed that I'd try to get a picture. I didn't hold out much hope, but the woodpecker seemed to have made a beeline - or perhaps that should be a woodpeckerline? - for the fat ball feeder, so it had obviously dined there before.
Sure enough, about a couple of hours later, there it was again on the trunk of the pine. This time I got a picture - and this time I could clearly see that it was a great spotted, with the distinctive white bar, like an upraised finger, on its side. Apparently, the juveniles have quite red heads and this is what had misled me.
Never mind. It's nice to see a woodpecker of whatever variety in the garden.