External and internal alterations including demolition of existing 1970's loft extension, removal of section of existing pitched roof, construction of a new flat roof extension with single ply roof finish, two new rooflights, and aluminium framed double-glazed window and doors, construction of new roof light to first floor master bedroom, erection of powder-coated steel railing to existing roof terrace, refurbishment of internal loft spaces , replacement of existing fibre cement tiles with natural slate. (amended scheme)