The idea
As some people know, a Robin Hood tax is a tax on banks and other financial institutions transactions.
There could also add piece of legislation in which, when enough money is raised (to combat the deficit), 40% of that tax income could go to some sort of Treasury Kitty that will be a bit like a savings account. The money saved could then could help future generations in this country when another version of the "Credit Crunch" comes along and the Country is suddenly in dire straits. It would come in very useful.
Why is it important?
It makes sense! The government could make billions even is the tax is at .05 or 005. It is a way of cutting the deficit instead of cutting public spending to the point of Austerity. You won't be punish the people for the Billions of £s worth of bail outs and over spending of the last government.