Sorry Paul, never heard of them.
Andyd,
I fish Southminster fairly regularly but I must admit it is not a touch on Straights Mill. There are plenty of mid to upper doubles to be had but the 20's are very few and far between. If you do have a look over there pit 1 or 3 are your best bet, pit 6 or 8 if you are desperate to catch. I was in pit 1 last night and had 3 fish, all around the 10lb mark. Have you thought about Asheldham? It is a very mature pit that is full of wild carp and can also produce a fairly good stamp of fish