Margaret Thatcher secretly considered the use of troops to break the on-going strike by coal miners, documents released by the National Archives show.
The papers show that ministers and officials repeatedly warned that a confrontation with the National Union of Mineworkers (NUM) and its leader, Arthur Scargill, was inevitable.
A secret Whitehall working group - codenamed MISC 57 - was established to lay the ground for the battle to come.
Plans were set in train quietly to purchase land next to electricity power stations - which were nearly all coal-fired - so that coal could be stockpiled to keep them running through a strike.
More top news
The Prince has called for "zero tolerance" on the ivory trade, which he says is increasing "alarmingly".
A memorial service has been held at Birmingham Cathedral to remember the victims of the Birmingham pub bombings 40 years ago tonight.
One of the world richest and most influential philanthropists has told ITV News that governments failed to act fast enough over Ebola.