"Note that the demand for Secondary Places will increase from September 2016 with demand outstripping supply from 2018. depending on the size of sites, the equivalent of two or three additional secondary schools will be needed by the 2022/23 academic year."
I well recall the controversy over the building of the ARK Academy in Wembley which attracted some very strange debate. The Lib Dem/ Tory administration in charge of the Council ordered a review of all the available sites, and none of them were brilliant. I simply can't imagine where two or three secondary schools can be built.
It also illustrates a point I have made before that authorities still have a requirement to provide school places, but not the powers. As the report says, Brent has no community secondary schools, and no power to demand an academy expands or ability to build a new school, except as an academy. The Council is dependent on other parties to make things happen. In the case of the Gladstone Free school, they simply didn't. Altogether, it strikes me that such a system is unsustainable.