The Duchess of Cornwall applied a traceable liquid called SmartWater to the Royal Artillery Memorial at Hyde Park Corner. The liquid is used to identify memorial plaques that have been stolen.
More top news
Alin-Cristi Lazar was caught putting the devices on the ticket machines around three stations on the Tube network.
Whirlpool is still forcing delays on customers with potentially dangerous tumble dryers, according to a consumer group.
They were buried at a Victorian cemetery between 1876 and 1924, but despite having proper funerals they did not receive headstones.