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aggi-
Looking at google maps the building is a perfectly standard ladder terrace, so the rear extension is two floors. What they've labelled ground floor is really the first, but including the ground floor entrance and stairs. Probably more accurately illustrated as attached, with roof terrace over the bathroom.
I think Haringey must've relaxed the rules for roof terraces at some point, I've seen a couple of applications granted recently.
Brun
Studio flat on the ground floor?