In article ,
Mathew Newton wrote:

I lifted a square foot of weed fabric I laid down last night and found these
(high res images for zooming):

http://www.newtonnet.co.uk/permanent/grubs1.jpg
http://www.newtonnet.co.uk/permanent/grubs2.jpg (probably around 50 of these
in a ball)
http://www.newtonnet.co.uk/permanent/grubs3.jpg

Wow! I revise my earlier diagnosis, such as it was, of "excessive
rainfall" to "excessive pests as well as rainfall".
I think you need to take steps. You could do with a local flock of
starlings/jackdaws ... but failing that Janet's post earlier gave a link
straight to some pest controllers. I'd ask your lawn suppliers if the
have recommendations.

I've never seen so many bugs in such a small area - ecchh!

John