Great Western and Southern Air Lines
Great Western and Southern Air Lines operated an airway letter service between Lands End and the Scilly Isles. A cachet was applied to the mail with a fee inserted in manuscript. The fee was initially 3d, increasing to 4d, probably from 1st April 1941.
October 1940.
Handstruck by staff and fee inserted in manuscript.
3d
 

4d
Violet or black. Up to 2oz.

7d
No copies known. 2oz - 4oz.

11d
No copies known. 4oz - 1lb.


Bibliography
The Story of the Airway Letter Service 1933-1988 D. Wilson, Air Mail News June 1994
The Airway Letter Service Supplementary Notes D. Wilson, Air Mail News December 1994