VHG. Your point about mines being closed under Labour only tells half of the story. Coal mines have always been closed for geological reasons. In areas of Britain like South Wales, the geology is difficult. While the best kind of coal, ie anthracite lies a plenty under the ground, getting it out is frequently difficult and sometimes uneconomic and maybe too dangerous to continue.
The Government of which Thatcher was leader. closed down coal mines for ideological reasons, not geological. You will notice that I used the phrase "Government" as we being urged not to be nasty to Thatcher. She didn't do everything....she had plenty of ministers to do her work for her.
Nye Bevan, the Labour politician who brought in the NHS, once said that
" This island is made mainly of coal and surrounded by fish. Only an organizing genius could produce a shortage of coal and fish at the same time "
Approximately 28% of our electricity is still produced from coal, most of which is now imported. As we are an island, it would seem to be madness itself to import anything that we already have in abundance.
The same goes for gas. In 2010 46% of electricity was produced from gas, a commodity that we are fast running out of and consequently we need to import vast quantities in order to keep our lights on. ( remember the Dash for Gas ? )
Vast civil engineering works had to be undergone in South Wales and the Marches in recent years order to lay a huge pipeline to bring gas from Milford Haven into the rest of the UK. That pipeline was laid over massive deposits of coal.
Now I am really, really trying not to be horrid to Thatcher but does that make any sense to anybody ?