Lt. Col. Sir Ian F. Bowater
Lieutenant Colonel Sir Ian Frank Bowater, GBE, DSO, TD (16 December 1904 – 1 October 1982) was Sheriff of London abd Lord Mayor of London from 1969 to 1970, the youngest son of Sir Frank Bowater, 1st Baronet, 1st Baronet (Lord Mayor from 1938 to 1939), and Ethel Anita Fryar.
Article in Wikipedia [1] and a file at The National Archives here.