This is a song about the occasion when Durham miners were offered a move to Nottingham; https://www.wcml.org.uk/wcml/en/our-collections/working-lives/miners/mining-and-mineworkers/

Farewell to 'Cotia. Jock Purdon was a deputy at Harraton Colliery in County Durham when he wrote this. The pit was always known as the 'Cotia (an abbreviation of Nova Scotia) and when it closed as part of Lord Robens's 'rationalisation' schemes, the miners were given the alternative of moving to Nottingham. Purdon put it up in the pit head baths for all to see that 'the death knell had been tolled for the colliery where the men were brave and bold.'

Ye brave bold men of Cotia, The time is drawing near
Ye'll have tae change your language, lads, Ye'll have tae change your beer
But leave your picks behind ye, Ye'll no need them again
An off ye go tae Nottingham Join Robens merry men

A new version of the song, A Warning, was adapted by Mel Calladine, a miner from Bufford Colliery, Nottingham, for the 1984 strike:

You working miners mark my words, The time is drawing nigh
You'll have to change your language lads, You'll have to change your beer.
But leave your picks behind you, You'll ne'er need them again
And off you go to Nottingham, To join MacGregor's men.