Pied Wagtail at Tarn Howes

Well, I think it's a pied wagtail, as it was definitely black and white, and it's tail wagged up and down, no doubt it's really something else, but that description seemed to fit it OK. it certainly wasn't shy!
It has been a really warm day today, at one point in Ambleside the temperature peaked at 19C!
(But the forecast is of course that it won't last) ;-(