Ok fair enough but I think the problem with modern extraction methods are that they require more space which Britain doesn't have.
I believe there was a fair amount of automation in many of the British pits, but it's hard to see how they could have remained competitive with the methods employed elsewhere (digging huge craters or taking the tops of mountains) without some form of protection against imports.
The big difference between the UK and Germany in my view is that the Germans on both sides of the political and industrial "divides" have broadly agreed on a long-term strategy and got on with it. Their banks are primarily geared to supporting "productive" industries, and there are many smallish companies that don't aspire to expand rapidly but continue to produce and employ in a stable and steady way. Thus despite not having the advantage of North Sea oil they have prospered on the back of ingenuity and solidity, absorbed a far more backward Eastern sector with relatively little disruption, and while they have some problems today they are on the whole doing pretty well.
Here we had a series of politically-driven about-turns from the end of WW2 through to the 80s, with the lack of stability making it very difficult to run a company profitably. And although policies in the last 30 years or so have had more consistency, it has largely been away from encouraging a balanced and broadly competitive economy and towards a disproportionate and parasitic financial services sector which has become a tail wagging a dog, sucking money and talent away from the rest of the economy and encouraging a short-term focus which means every other business is only as good as its last (or next) set of results. Labour in the last decade tried to do some good with the tax revenue from the City, but I can't help thinking it was like the the other birds expecting the cuckoos to help them out.
We now have a society where the prosperous south-east is rapidly drifting away from the rest of the country (despite the generous gifts of second-hand 319s!) and while I actually believe George Osborne is genuine in trying to address this, it is probably too little too late. Our workforce is poorly educated, or in some cases quite well educated but not in the right things, and there is an ugly insular attitude which doesn't help us in finding our place in the world.
With the benefit of hindsight, when the government decided in the early 80s that the writing was on the wall for many of our traditional industries, it should then have considered where Britain should be heading, and used some of that oil revenue to build an economy and infrastructure to support those objectives. If that had happened then I think we would still have lost most of the mines, but proper transitional arrangements would have been made to transfer the workforces into more healthy and sustainable industries.