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
A man with no recollection of who he is has been found in London, with police appealing for help to identify him.
London Underground has made a new offer to unions to try and avert next week's tube strike. But will it work? Here's what you need to know
The Metropolitan Police has responded to allegations that they refused to enter the water to rescue a teenager who was drowning