Change of use of second floor (including mezzanine) and third floor from Class B1(a) office to Class C3 residential to form 34 flats (24 studios and 10 one bedroom) (56 day application for prior approval in respect of transport and highways, contamination, flooding, impacts of noise from commercial premises and provision of adequate natural light to habitable rooms under Class O, Part 3 of the General Permitted Development Order)