The Fivepenny Piece web site says KING COTTON was written by John Meeks and Colin Radcliffe.

The song KING COTTON appears on the following Fivepenny Piece albums:
LP "King Cotton," EMI EMC #3129, 1976;
LP "The Very Best of Fivepenny Piece," Columbia SCX 6612, 1979;
CD "Fivepenny Piece," EMI IDEAL CDP 7 96079 2, 1991;
CD "The Very Best of Fivepenny Piece," MFP 94354 2, 1991 (1998);
CD "The Fivepenny Piece Collection," EMI Gold 3629292, 2006;

And on one John Meeks album:
CD "Just Me and Some of Mi Songs," Wednesday Music JMSLJ04, 2004.

I found a few sound samples, but found them hard to understand:

...built his chimneys tall and strong on ... and grimy mills
And crammed the houses in between. Thank God he left the hills!
They lived in houses squashed in rows, while ... invention
A life of toil with few rewards, no substitute for....