The UK did import "cheaper" coal from Poland for a while and yes, some mines were profitable.
However, mining was seen as an essential core industry, an idea that went out of the window in the Thatcher era, when everything became about "the market".
Promises of cheaper, water, gas, electricity and the nationalised industries were all sold off for a quick buck.
How has this worked out ?

I agree we should never have sold the silverware, the working man made money from buying and then selling the shares, it helped to win her another term ,in my opinion we are paying a big price because of Thatcherism ,one the country will never recover from, it gave birth to the underclass

Might be wrong here but wasn't they sold off because they were all running at a massive loss aided by the unions.

There was certainly a desire to break the power that the Unions had and privatization of the utilities was seen as an effective way of doing so and it's fair to say that the policy was very effective in reducing the power of the Unions.

The loss making issue was a little less straight forward.

If government wants to cap prices for certain utilities, they would certainly have to "help" by increasing their financial input or, show a loss on the balance sheet.

Some of the price increases that we are seeing at the moment on gas/electric, would have very likely been "subsidised" under public ownership, something with just doesn't happen in the private sector.

Some would argue that the utilities were sold "on the cheap" to help curb the Unions and that many are now making hefty profits for overseas companies and on the face of it, that seems crazy.
Has privatisation been good or bad, well, I suppose it depends on your politics and who knows whether our bills would have been higher or lower under the previous regimes.
It was certainly simpler back in the day and you didn't have to worry about shopping around, exit clauses etc and you knw exactly who to contact when there was a problem

Scargill turned down an offer from Thatcher to invest £800 million (a Kings ransom in the early 80s) in viable pits. He turned it down because "not 1 pit will shut". A ridiculous position to take and designed to provoke confrontation.
A lot of people think it was Thatcher that engineered the strike. IMHO I think it was Scargill, he wanted to bring down an elected Tory government, just like his cronies did with Heath.

Scargill thought that Union power would win the day. He was wrong.

Scargill was right, he just went about it the wrong way.

Scargill thought the whole union movement would support the miners and cause a general strike - he was wrong and the writing was on the wall when Callaghan lost the election a big part of which was a desire of the general public to stop all the needless striking. Scargill lived in his own little commie bubble - sadly for all the members.

Unfortunately union members are just expendable collateral in the political struggle.

Interesting fact I would appreciate a source for that as never heard that before ?

Rubbish at that sort of stuff. Found an article about macregor in the guardian but it's scant on details. I'll keep trying but I saw it on a TV documentary and I'll try to find it.