New mansard roof to replace existing pitched/flat roofs, including 3No. new dormer windows and 6No. new rooflights and installation of three new windows at first floor level; First floor rear and side infill extensions; Change of use of part ground floor to residential including internal alternations to provide 2 (1 x 1 bed and 1 x 2 bed) additional self-contained flats (Revised description)