1911 FIRST U.K. AERIAL POST LONDON ENVELOPE IN BRIGHT GREEN TO SALISBURY. Good to fine London envelope in bright green, minor imperfections, addressed to 'R. L. Pollock Esqre., Burroughs Hill, Salisbury, Wiltshire' with KGV 1d Downey tied very fine strike 'FIRST UNITED KINGDON/AERIAL POST LONDON' date stamp SP 9 1911, Die 1. On reverse 'SALISBURY' date stamp SP 11 11. (Ref 150723).