Alwyn you have a selective recollection of the 80’s/90’s. I was there where you?
With regard to coal production of the 80’s it could have been mined and given away for free and still made a profit if it had been given the same subsidies as North sea oil. The decision to close the mines was a political one based on the increasing power of the trade unions, not an economic one.
With regard to the multiplier the way you refer to it indicates you dont know what it means. It is not a static thing it is dependant on other factors within the economy consequently the delay between government spending and the impact on what you and I perceive is variable.
If you have studied economics (unless you are a Monetarist) you will understand the paradox of thrift. This means rational individuals should save during bad times but Governments should spend. If Governments do not spend now (and almost every European country agrees on this point including Europes largest economy, Germany) then the recession will be significantly worse and will last a lot longer. The Conservatives ridiculous macro economic policy of "purse string tightening" may appeal to the daily mail readers but it would be disasterous if it where to happen.
The recession of the 80’s I recall was less based on external factors than this one and the economic experts in power then responded by fighting inflation at the cost of jobs and raising interest rates to over 15%. They were raised twice in one day!!! Cant believe they are giving lessons today!