Correct -- sounds like "oakum" as in "picking oakum" -- taking thick ropes apart, by hand, for the fibre to be re-used. (When as a kid, I first came across the expression -- no doubt in reading some kind of historical stuff -- I imagined that it must mean some valuable plant which grew only in Rutland; and had to be harvested by hand, toilsomely and painfully.)
Picking oakum in mentioned in the Round the Horne sketch "Moby Duck" in which it is described as "an unpleasant habit but it passes the time at sea".
There was absolutely nothing which that lot couldn't, and didn't, energetically "muckify" -- I say that partly in admiration.
Swansea (I don't know how that fits the previous clue)
Correct, your turn...
Blundellsands & Crosby
Right on, buddy ! Next 'un's yourn.
Thank you.
...and it's in West Yorkshire.
Guiseley is correct, your turn...
Netherfield