Planners are only concerned with planning law and have no remit over any other permissions or requirements of the householder/applicant. This means they can't let anything but planning law determine their decision.
I full accept what you are saying, woody, but in the case of ex-council houses, is the covenant between the council and the house owner?
Therefore if the permission of the council is sought, surely it is immaterial which department of that council receives, and grants permission? They are considered as representatives of the council.
I can't think of any suitable analogy.
I suppose if say, social services give a decision on a situation, which is then acted upon, and the situation develops over a period of years without problem, could say the education department (assuming education and social services are the same council) overrule in retrospect the earlier decision, causing a backtracking of any development over the years, which was acted upon in the good faith of the earlier social services decision?
I would argue that is unreasonable. Surely it is incumbent on the council to act jointly, not for one department to act unilaterally, potentially endangering any future action by another department
I accept we are exploring a hypothetical scenario.