Construction of part single/part three storey rear extension and creation of lower ground floor to existing building currently divided into 5 flats to enlarge existing flats and provide 3 x 1 bed & 1 x 2 bed new flats (8 x 1 bed & 1 x 2 bed flats in total) following demolition of existing single storey rear addition with external/internal alterations, new retaining boundary wall and railings, bin/cycle stores and parking