Heathrow Airport has been fined £120,000 (U.S. $158,000) after an unencrypted USB memory stick, which may have contained details about the Queen’s travel plans, was discovered in October on a street in London.

The memory stick belonged to a Heathrow Airport employee and contained 76 folders and more than 1,000 files—none of which was encrypted or password protected. The person who found it viewed the material it contained at a local library and passed it on to a national newspaper (The Sunday Mirror), which copied the data before passing it back to the company five days later.

Neil Hodge is a freelance business journalist and photographer based in Nottingham, United Kingdom. He writes on insurance and risk management, corporate governance, internal audit, compliance, and legal...