This is quoted in Roomer: The Newsletter of the Traditional Drama Research Group, Vol. 4, No. 6, 1984, page 53-54. (Click for a PDF.)

Through the hills and the valleys where I used to roam
Come follow, we follow, we follow the plough. 
With four fine horses hooked to the plough
We hollo, we follow the plough. 

There's Bonny, Duke and Smiler and All Sorts at the rear,
Four fine horses, hooked to the plough,
Up and down, round and round, many miles a day
We hollo, come follow, we follow the plough.

With the rumbling of the shil-board, and the half-grass wheels
We hollo, we follow the plough,
There's Bonny, Duke and Smiler and All Sorts at the rear,
Four fine horses hooked to the plough.
We hollo, we follow, we follow the plough.

There's a Foremos', the Lashhoss, the Bodyhoss, the Filler.
Four fine horses hooked to the plough
Up and down, round and round, many miles a day
And we hollo, come follow, we follow the plough.

One more bout said the carter's voice
One more bout and we're homeward bound,
As we follow, we follow, we follow the plough.