External alterations including re-cladding, new window and door locations, window replacement and change of use from B8 warehouse use with ancillary offices to Class E (g) (i) [display or retail sale of goods] to allow trade counter use of part of the Building; Class E (g) (i) & (iii) [office and light industry]; Class B2 [engineering workshops] and Class B8 [warehousing and open storage].