Expenditure on schools doesn't correlate to success in education.
yes it does.
Kazakhstan = Rank 23
UK = Rank 30
1=S. Korea
2=Finland
3=Hong Kong
4=Canada
5=New Zealand
6=Ireland
7=Australia
8=Liechtenstein
9=Poland
10=Sweden
international league table of reading and maths standards, based on test results in 2006.
Just because there are 4 exceptions (Kazakhstan, Cuba, couple in S. America) doesn't mean there isn't
correlation.
If you seriously believe there is no correlation between quality of education and expenditure you're saying that education is independent of:
Class sizes
Teacher training
quality and amount of books
quality and amount of equipment
and the hours that children get taught between.
Cash input and attainment don't follow a perfectly linear relationship without exceptions. Of course they don't, because nothing in the real world does.
Anyone who's had a sniff of state education in the last decade knows that labour has done great things with it.