I totally agree with all you say. My business was based in the coal fields of Notts and Derbyshire and the closure of the pits signalled boom time for a period, then absolute collapse (which happened years after the pits were closed). I had to relocate the venture to the West Midlands, Staffordshire and Hertfordshire. This meant that I had to leave home each morning at approximately 5.30am and return home at about 6.30pm. This was 5 days a week for 10 years.
We not only survived, but did quite well - but it was very hard work.
Our vans used to get stopped by the police all the time during the strike to check if we were carrying any 'flying pickets'.
The pits were being closed long before Thatcher, as the governments under Harold Wilson and then Jim Callaghan had already embarked on a massive pit closure program without the then large redundancy payouts to miners that Thatcher introduced (through Ian MacGregor). Of course with Thatcher not being Labour, she is portrayed as the person who destroyed the coal fields and the communities, but that isn't factually fully correct.
Coal from the 1960's onwards cost so much more to mine in the UK than it did elsewhere. Either the mines had to catch up or the consumer had to pay a lot more. However, we both know that it wasn't about the mines, it was a show of strength that the unions would never again bring down a government. That was where the collateral damage occurred.