My school will legally cease to exist
No. There is a separate funding agreement for each school in the MAT.
Funding will go to the MAT, not individual schools within the MAT and the Board of Directors is required to make spending decisions based on the MAT priorities, not individual (ex)school priorities
No. Each school receives individual funding. It does not go to the MAT for them to devolve as they see fit. The GAG goes to individual schools who will pay some of it to the MAT to fund central functions.
The Board of Directors of the MAT can be paid for their roles
The directors are trustees of the charity. As such they cannot be paid for their roles. They can be paid for providing goods or services for the school but there are controls around that (the controls won't necessarily prevent fraud, but that happens in LA-controlled schools as well). Only a minority of the trustees can be paid in this way.
Teachers are employed by the MAT, not the individual schools (and can therefore be deployed anywhere within the MAT)
Yes, teachers are employed by the MAT but that does not necessarily mean they can be deployed anywhere within the MAT.
There is no legal requirement to keep the individual school’s board of governors, and as it will have no power beyond what the Board happen to devolve, it will only be a talking shop anyway
It is indeed up to the trustees to determine what powers to devolve to the LGB but that does not mean the LGB is only a talking shop.
The MAT will be run by a board of governors, akin to the board of directors in a business. This board will consist purely of co-opted members, no requirement for parent governors, no teachers, not necessary local people. Appointments are neither required to be advertised, nor elected and members can only be removed by the Secretary of State, from London
Your school is run by a board of governors, akin to the board of directors in a business. There must be two elected parent representatives either on the board of the MAT or on each LGB. The other directors are elected by the members of the trust, not co-opted by the directors (although the directors do have the power to co-opt if necessary). The members of the trust can remove directors by resolution. They cannot remove the parent directors - they can only be removed by the parents. A director can also be suspended by the other directors. Directors serve a 4 year term after which they must face re-election. Under some circumstances a trustee can be disqualified.
The only form of public scrutiny is the published accounts
If you are interested in financial scrutiny, yes. Ofsted and the EFA also monitor academy trusts and the Charity Commission can investigate breaches of charity law. The LA also has some involvement, e.g. in monitoring SEN provision.
The only way parents can hold the MAT board to account is via the Regional Schools Commissioner. (There are going to be 8 for the whole country) The RSC will be appointed by the Secretary of State
And Ofsted. The RSCs already exist, by the way.
The Secretary of State retains the right to remove, or force schools/ MATs to join other MATs
Yes but only in limited circumstances such as the school underperforming.
As for being held to account, I'd rather be going for support to a locally elected council, democratically accountable locally than a faceless bureaucrat put in post by their mate at Whitehall, but then loyalty to democracy does seem to be rather out of fashion these days
You may not get anywhere with your locally elected council. Some won't deal with complaints about schools at all. Even if they do, all they can do is review whether or not the school has taken the decision in the correct way. They cannot overrule the school's governors. And if you do complain to the local council about a school you won't be dealing with someone who is democratically accountable. You will be dealing with a faceless bureaucrat who works for the council. You can try complaining to elected councillors but they don't have the power to intervene in the running of schools. All they can really do is raise your concerns with their bureaucrats. Just like the bureaucrats, your local councillors have no power to overrule the governors.