Roberts and Barrand sang it on their "Live at Holstein's" album (available only on cassetter tape from Andy's Front Hall records). Apparently collected from a popular 30s or 40s song -- anti-capitalism stuff.

Their chorus is a bit different:

" For I reaches me hand for the watering can, and I waters the workers beer For I've got a car, a yacht, an aeroplane, And I waters the worker's beer."

Cheers, Brian