75% of schools offering Diplomas - really?

DCFS have said that nearly 75% of schools and 88% of colleges will offer the new diplomas in September.
Now that's a big number and in my experience, it seems to be a lot bigger (in schools) than I find on the ground!
It also doesn't check out with the stats on the excellent "Diploma Video" which quotes 40,000 learners across 1300 institutions.
I reckon that's about a third of secondary schools.

Mind it would be great if it was 75% of schools!