Bat!

Tonight, just before sunset, a largish bat flew around the garden two or three times. It appeared half as big again as the usual Pipistrelles and seemed to have a somewhat slower wing beat. Very poor images (3200 ISO!) but does anyone have any idea what species it might be?

Postscript!
I'm informed by Geoff Allen, who kindly took the time to e-mail me, that the bat has the bulk and shape of a Noctule Bat. Thanks Geoff!