Looking for a song which starts:

We plough and sow,
We're so very very low,
That we delve in the dirty clay...

Basically it was about the rights of the workers being taken from then, and had sentiments like the the mine workers having their wages stopped if they didn't bring up enough coal. The tune was 'The star of the County Down', and yes, I've checked the Digitrad...

Thanks,

LTS