Construction of mansard roof extension to provide two flats at third floor level; change of use of first floor ancillary office and staff facilities to create one self-contained flat; first floor rear extension over ground floor retail unit, to provide additional two flats; reconfiguration and internal alterations to existing four residential units; facilitated by single storey rear extension; alterations to existing shopfront; formation of new residential side entrance and adjoining bay projection; first floor rear terrace with associated timber screening and further associated external alterations