Hi alun j. I read your report with interest.We in wales use what they call maddies, these are harbor rag which are bunched up on a fine wire hook size 1 or 1/0.
The same method catches the golden grey mullet off llangenith.
I know there are different methods around the country but try these little critters out,you never know they might work where it's muddy.
all the best .
chas....