It's quite simple: the LA dont want to bare the cost of schools; you can either choose to self change into an academy and be responsible for your own finances OR you can sit back and wait fora hostile take over by an established academy chain.
If you want a bit of light reading - take a look at Harris Academies in the SE .... very marmite (love or hate them) but they take in NQR~TS, chew them up and spit them out in two years. Look at TES and the sheer volume of Harris jobs advertised.
Roke as in Croydon - Harris? good luck with that! or is it TKAT? or Haberdashers?