On Saturday, 6 February 2016 09:38:07 UTC, Another John wrote:

Back on topic: Mathew: One of the first things I'd have done is email
those pictures to the people who make the lawn (seeds?)

Excellent idea - have just sent them (Rolawn) an e-mail.

FWIW -- my one view is that this is excessive rainfall.

I am fearing that too, and in particular that I might be short of options to mitigate it in the future.

I have never forked the lawn since laid - might this alone help? Presumably it should be done once the weather starts to dry in order to avoid further compaction (from the walking and forking)?

Mathew