Variation of Condition 6 (Materials) of planning permission 20/0570/FUL (Variation of Condition 2 (Approved Plans) of planning permission 17/0820/FUL (Erection of a pair of semi-detached houses with accommodation within the roofspace with associated parking and landscaping) to include an additional single storey rear projection, alterations to internal layouts to include conversion of garages and external alterations to provide associated parking) to vary materials