In email to a villager today Anglian Water said:

I am sorry to read of the odour problems you have been experiencing
and appreciate how distressing this must be.

Unfortunately, we have been experiencing operational difficulties at
the pumping station which we are working to resolve. All the odour
control units are fully operational and are performing as required.

The issue we have is with the wet weather. The bad weather has meant
that the storm lagoon has been in operation and is in the process of
drying out.

I understand the problem has now been resolved. However, should you
experience any further problems, please do not hesitate to contact
our operational centre on 08457 145 145 to report any problems for
further investigation.

So they are claiming the problem is solved. It certainly wasn’t in the
country park yesterday but we’ve not smelled it today. If you have or
you do after reading this then please don’t hesitate to complain.