Coal is cheap and abundant in the English Midlands, which explains much of the industrial revolution starting there.
Said collieries, which if put back into service, would be able to cheaply get coal to Ireland via barge at no great cost or latency.
Coal was abundant. British coal was mined out. The coal that is left isn’t economical to mine.
The UK's deep mines would be spectacularly uneconomic. Some have been sealed permanently (for expensive values of permanent) and the supporting knowledge and infrastructure would have to be rebuilt.
Coal makes as much sense as a modern fuel as horse drawn buses do for transport.