Any further queries should be made to Southern Water on 0800 820999 (7 days a week)
Update later on Saturday: Southern Water have now attended and say the drain is now running freely. They suggest that the overflow was during the recent period of heavy rain. They also told us that they were unable to get to the manhole cover as it has had heavy stuff piled on it by the nearby plotholder.
It is essential that Southern Water can get to this manhole cover when necessary - overflow of sewage onto the plots just isn't nice and the next manhole cover is too far away to be of use. Please clear any stuff on manhole covers on all sites, and keep them clear!
Sewage does contain bacteria, but these are killed by sunlight and frost, so no longer-term contamination is taking place. However, it is essential further overflows are reported.