Snuffy - Concur with your comments on Dyke maintainance crews, if I remember correctly, "Banker/Banksman" was also used on the Romney Marsh and the North Kent Flats, Whitstable, Faversham and the Medway and Swale. ( Sorry your post triggered thismemory)

Very Vauge memories suggest that there was a pub on the Essex Marshes named the "Banksman" - Can anybody confirm ?

Or

"And the Bank engine was pushing behind,
And the driver was John Axon"

Gareth