BoffinMum - You are correct that a VA school is its own admission authority. I'm afraid that is the only point where the first paragraph of your 10:58 post is correct.
The current Admissions Code for England is dated 2010. VA schools and academies do not "opt in" to the code. They have no choice. All VA schools and all academies MUST comply with the Admissions Code in every respect regardless of whether or not they want to. They are not exempt from any part of the code. The School Standards and Framework Act 1998 requires VA schools to conform to the Admissions Code. Academies are required to conform by their Funding Agreement.
Rosebud05 - I wasn't intending to say that she should disbelieve her union completely but she should be aware that the teaching unions are against academies and are not a reliable source of information. I have seen a number of untrue statements from teaching unions. Either they have not bothered to find out the facts or they are deliberately misleading their members.
I have to say that in my line of work I have found the exact opposite to what you report. Coucils are shambolic and disorganised, have reasonable staff retention but high rates of sickness, little or nothing in the way of training for staff and give a very poor service. In the private sector things are more organised, staff retention is also generally good, sickness rates are much lower, training for staff is more readily available and the service to clients is much better.
On average sickness rates in the public sector are over 50% higher than in the private sector.
In the private sector it is important to win and retain customers. You can get away with giving customers a poor deal in the short term but in the long term you will lose out to businesses offering better value for money. Unfortunately residential homes and day centres are an area where the client's views frequently carry little sway with the person choosing the supplier, who is often only really interested in minimising cost. With schools, if the government achieves its stated vision, the "supplier" (the school) will be chosen by parents and schools which fail to respond to parents wishes will find it difficult to attract pupils.