I heard (and recorded) John Foreman singing this in 1972. Once the audience had got the hang of the coffee version of the chorus, he would throw in the following variant

All I want is a proper pint of porter
Poured in a proper pewter porter pot
I may be off my dot,
But I want a pint of porter in a pewter porter pot
Iron porter pots and tin porter pots,
They're no use to me,
If I can't have a proper pint of porter from a proper pewter porter pot
I'll have a cup of tea!"