There are three Derwentwater songs: they have first lines and Roud Nos. as follows (titles vary a bit):


Lord Derwentwater
Our king he has wrote a long letter
Roud: 89

Derwentwater
Oh Derwentwater's a bonny lord
Roud: 3158

Derwentwater's Farewell
Farewell to pleasant Dilston Hall
Roud: 2616


The song from Motherwell is a version of Roud:89 and Malcolm points out in his post above that the 2nd tune is the tune associated with that.

Mick