I have just read the letter signed by 80 Heads or people involved with Academy schools., The obvious thing that jumps out is that the majority of the signatures are from grammar schools heads or from highly 'middle' class comprehensive schools.
The reason these schools are able to benefit from 'Academisation' is because these are all highly sought after schools due to results or location.
These schools also are unlikely to employ 'unqualified' or non specialist teachers ,due to being able to have the pick of teachers because of their reputations.
This of course may not be what happens in a inner city or deprived school , that is taken over by a company or 'religous organisation' and turned in to an Academy. These who either intrested in cutting corners or using it as a instrument for religous dogma. For the record DD2 s grammar as stayed a community school, DS grammar is an academy , I have noticed little difference between the two (maybe DS is a bit more'business' like asking for money) but in reality they are both equally good as schools.