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Our neighbours do have an extension, it's one that slopes down from just below their upstairs window so the highest point must be more than 3m.
tbc-
Oh okay - so actually seems the main constraint is how your extension will adjoin theirs. Party wall, gutters, flashing etc. I’m sure your architect is across all that. The gable pitch makes more sense in that case to me as the low point on the party wall will become a valley gutter flashed into their extension flank wall. For a flat roof you would need a parapet to master their roof - and that will all end up too high . Probably . If I understand it right.
Sheppz
Assuming neighbours don’t have an extension - eaves height on the party wall boundary will probably be the key constraint in my experience. Really annoyingly seems all councils have their own expectations. I’ve had everything from 2.6 - 3m. It’s why most side return infills are pitched.