The Barnett Formula is usually presented as an item of political arcania of interest only to those of extreme anorak tendencies, but today's Daily Mail front page about the consequences of Scotland's great public spending power demonstrates that it is not.
As I have been arguing for most of the past decade, both on this blog and in numerous columns in the Newcastle Journal, the fact that public spending north of the border is some £1,200 per head higher than in England has real implications for real public services that affect real people. It was only a matter of time before someone came up with a really emotive example that brings the story to life, and the row over blindness drugs has seemingly done that.
What is set to make the situation even more combustible is that the new Scottish First Minister Alex Salmond is also highly critical of the Barnett Formula - not for the same reasons as many English MPs, but because he thinks it doesn't go far enough.
I've been saying for a long time that, one day, the need for reform of this unfair and outdated formula will become a political issue of the first order. I suspect I won't have that much longer to wait.