Just out of interest, did they give any reasons as to why they want to increase?
Crypt stated their reasons were due to increase in demand, always oversubscribed, a need for more secondary school places, can accommodate more students etc.
The real reason is more prosaic. Bums on seats = more money. Not saying I blame them - all schools are squeezed at the moment. All the grammars are expanding...the individual minutiae are a bit different between them but essentially it is about money.