Hi Emiso,
Yes I think there is a paper trail laid down now to show that a PP Meeting took place.
As you say, nothing gets agreed in such meetings - they are intended to inform the potential applicant of issues so that they are dealt with in the application proper.
In past years, applications would land on the Local Authority's desk with glaring inconsistencies in them such that they would have needed a material contravention to sort them out.
In particular, pre-planning meetings are intended to inform layperson and professional alike of policies in the Development Plan that the application should comply with.
I've found them particularly useful where a line or two in say the environment section about "preserving existing hedgerows" could so affect a design as to render it unprofitable for the developer to proceed.
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.