Posted: 02/03/2014 at 12:50
Yes I'm sure the problem is leatherjackets ...chafers too. There was a lawn grub killer, now banned, that eradicated them. Nematodes can be used next year for them.
I would, when a little drier, rake your lawn pretty vigorously and re-seed.
The birds are going for the grubs but also, probably, for the thatch, etc., for their nests.
A good routine would be an autumn rake and spike following a late summer application of nematodes