I find this interesting....
The Daily Telegraph interviews the formula's inventor, Lord Barnett.
The 90-year-old devised the calculation in 1979 when he was chief secretary to the Treasury in Jim Callaghan's government.
Lord Barnett tells the Telegraph that his solution - which aimed at saving money by getting rid of the need to have secretaries of state for Scotland, Wales and Northern Ireland - was "fundamentally flawed" as it used incorrect figures for Scotland's population.
The resultant "over-allocation" of £1,600 more per Scot than per English person "means [the Scottish government] have been able to do things that we can't, like [cap] prescription charges and university fees. That's not fair on English taxpayers," the former politician says.
"The real problem is that now no politician wants to tackle it," he adds.
But he cautions: "In my opinion, the leaders will have a job getting any new devolution plan through that keeps the Barnett formula."