Mikey //Mamy...if you read the link, you will see that this is a new departure, forced on Grammar Schools by cuts in funding.//
If you go to the last line of the article you will see that these are proposals out for discussion:-
//A consultation on the proposed new funding formula is to run until March.//
I recall the statement by Justine Greening on the subject in the HOC and subsequent questions on the subject of school funding.
Apparently, there are such inequalities in the current system of funds allocation to the extent that is possible for two virtually identical schools in the same area to receive different funding purely as a result of the formula being used.
The current exercise try and find a fairer system.
You can read about it more fully here:-
http://researchbriefings.files.parliament.uk/documents/SN06702/SN06702.pdf
Obviously, schools that may loose out under an early draft will be the first to shout but as everything is at the consultation stage I think it's a bit premature to start shouting 'cuts' particularly as in your 'question' you correctly quote 'changes in funding'