What do you call a flock of Lapwings? 03/10/15

Not the greatest of shots today but an amazing sight nonetheless. This year I have spent hours waiting to catch a glimpse of a Lapwing on the railway, been photobombed by one or two on the coquet estuary, spotted and captured one or two on the flats around the Aln, but today topped this as a "flock" of them (if that's the right term, swooped down onto the flats surrounding the meeting point of the river coquet and Amble Harbour.  I am sure it is not uncommon but certainly I and my cousin had never seen this before.