Variation of Condition 1 of planning permission dated 29 September 2020 (20/03669/FULL) for replacement of existing extension at rear lower ground floor level with two storey extension at rear lower ground and ground floor level; extension to existing closet wing at rear second/third floor half landing level; mansard roof extension with rear terrace; new staircase to front lightwell; all in connection with use as two residential flats (Class C3). Namely, to widen rear dormer.