The letter below from Bath attempting to go via Lisbon to France was returned by the Censor, along with a refund of 3½d postage because Air Mail had been paid for but not rendered. The amount refunded was the difference between the Air Mail and the normal postage.
The reason the Censor returned the item was that it had contained unused Postage Stamps. Permits were required to send postage stamps abroad (along with Christmas Cards, Greeting Cards, Calendars, printed matter, literature for the blind).
