You're welcome BMD.
The essence of it is - I fear to say too much.
I know that seems hard to believe looking at one of my longer posts, but qualifying the advice given and rounding it out to a certain level is what makes up the post.
It took me five years of study, with over a years spent working on building sites and at least three years post graduate experience at a wide variety of jobs to become what I would class as "competent".
These days I have to constantly run to stand still, reading and digesting new Building Regulations, so-called "approved details" that only deal with sealing and insulation, and new building practices several of which leave a lot to be desired IMO.
I'm wary of advising in detail over an internet connection - there are too many unknowns and too much rests on detail design, turning corners and angles, services penetrations, radon gas boxes and close fitting of elements. All good stuff, necessary stuff, impossible to do remotely stuff.
That's where I'm coming from - thanks for understanding.
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