Sorry, they don't think it's just down to low expectations.
I think they think that if a child is behind the child should be tutored extensively in and out of school till they catch up. (And presumably if the still fail, then keep them back or turf them out of MS.)
It'd be great if the govt would pay for a specialist teacher to help kids when they first fall behind (or at the beginning if they start behind ) - can't see it ever happening though :)
I don't think Gove gave them a remit to design a new curriculum which cost more money than the current one. :)