Martin's Haven: 1000+ swallows an hour

The visible migration of Swallows that I noted at the Gann yesterday was in full flow this morning, with what are to me astonishing and continuous flows of birds from c.0800, all flying directly W-E.
I realise now that I seriously underestimated the number of birds yesterday, so set out to do the thing slightly more scientifically. I did 4 counts, one each half hour from 1000, and timed how long it took to reach 100 birds, using the Deer Park wall as the crossing point. In each case it was almost exactly 6 minutes, giving a rate of 1000 per hour!
Interspersed with the Swallows are much smaller numbers of martins, roughly evenly mixed House and Sand, but I estimate >95% of all the birds are Swallows.

Fewer warblers in the valley today and no Spotted Flycatchers (one was feeding actively by the road late yesterday evening), but still some willowchiffs feeding (as well as 1s and 2s flying W-E), and plenty of Linnets, a female Reed Bunting, and 2 adult Grey Wagtails. A very confiding male Kestrel, and a very vocal Buzzard.