1911 FIRST OFFICIAL U.K. AERIAL POST/USED LONDON ENVELOPE IN SCARLET CANCELLED DIE 5. Good example (slight creasing) of the London envelope in scarlet with KGV 1d Downey scarlet cancelled fine strike FIRST UNITED KINGDOM/AERIAL POST LONDON date stamp SP 9 1911 with the scarcer die 5. Dies 5 and 6 are much scarcer as they were used at Hendon airport on mail collected locally and from the John Barnes and Roper's stores. Card addressed to Worksop, Notts. (Ref 104511).