Edgar Percival posing alongside the first "new build" Mew Gull, G-AEKL, at Gravesend. It was flown by Percival in the 1936 King's Cup Air Race and the Folkestone Trophy Race that summer before being sold to Air Publicity Ltd for use by Tom Campbell-Black in the Schlesinger Race. It was then fitted with a Gipsy Six Srs II and DH variable pitch propeller, becoming an E.2H in the process.

The Mew Gull in its original form at the Press Launch held at Gravesend, Kent, on 15 March 1934. Powered by a Napier Javelin it was flown in very blustery conditions by Edgar Percival. Designed and stressed by R H Bound, it was modified with a Gipsy Six Srs I, single strut undercarriage and new tapered wing - all designed by Arthur Bage - before competing in the 1934 King's Cup Air Race. A new fuselage was then designed by Bage, and with the new wing and undercarriage from E.20 fitted it became E.20A. The original airframe survived until burnt at Luton in July 1945.