Mystery sitter in a bow tie

This inter-war ‘English school’ portrait of a seated gentleman wearing a bow tie, bought for around £150 three decades ago, sold for an unexpected £7600 at Charterhouse (21% buyer’s premium) on January 17. The unfinished 4ft 2in x 3ft 4in (1.27 x 1.01m) oil was dated 1922 but unsigned.