Sitting in my garden in Knaresborough ( N Yorkshire ) for the last half an hour ( 1300 - 1330 ) there is a noticeable SW movement of mainly House Martins but with some Sand Martins and the odd Swallow. I rarely see any hirundines in this part of the town (other than a pair of swallows which breed about 100m away ) so there is definitely some movement going on, anyone else seeing it?