Hi Faszero
Lack of wall ties contravenes Part A Structure
Lack of the ope closers contravenes Part B Fire
You can seek dispensation, but you are unlikely to get it.
Rockwool, which is fire resistant needs wire reinforcement and is not THAT rigid.
Insulation that is rigid like expanded polystyrene is flammable and not THAT rigid.
You could look at a SIPS or ICF system, both each have their good and bad points.
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.