Thats them ,,, I reversed the flow and used the pan scrubs as a rough primary filter ,, depending on the make of filter depends where the fuel enters and leaves , but they can be reversed by swapping the ins and outs on the filter heads the pan scrubs still let water seperate but also worked like the white plastic gause in the old tank outlet filters ,, I found thata quick wash and the pan scrubs were as good as new and you only used a secondary filter once in a blue moon ,,, not perfect but fast and easy , again with twin engines popping into the engine room to swap the change over lever only took a few seconds , and the other engine gave you way and steering so you were never in danger of anything nasty happening ,,, a battery couple switch is a mighty handy thing to have too ,,,,The blocked filters were the ones with water traps, the others are pretty normal.
I've got some treatment in the post as well as a load of new filters.
I'll look into the agglomerators