Thatcher got immersed in Reaganomics, so set about dismantling anything that could be broken up and sold off to the highest bidder. This was then replaced abroad by cheaper materials and labour. Manufacturing went to the wall. Utilities. Rail. Infrastructure. Privatisation of government services. Short term vision for quick £££££.
Country would be in a far better place if we were not simply a service provider, and actually remained an industrial player, like we used to be. Would not be so reliant on ......well, pretty much everything. So BrEXit - move out of a massive trading bloc and go it alone.......with very little to export and importing a lot. What could possibly go wrong?