Alex Henshaw with His Record-Breaking Percival Mew Gull at Gravesend, Kent, UK - He Was the Winner of the 1938 King's Cup Air Race at an Average Speed of 236.25 M.P.H. over a Triangular Course of 1012.14 Miles - the Fastest Ever Recorded by a British Aircraft. in February 1939 Henshaw Also Flew a Mew Gull from England to South Africa and Back in Just 4 Days, 10 Hours and 15 Minutes, Smashing the Previous Record.