Individuals and organisations which look after war memorials are being encouraged to apply for free "SmartWater" kits.
A unique traceable liquid, which is painted onto the memorials, "SmartWater" is virtually impossible to remove - and can even withstand burning and sand blasting.
Today, the Duchess of Cornwall helped to protect the Royal Artillery Memorial on Hyde Park Corner, by applying the fluid with a paint brush.
More top news
Train, tube and tram passengers can use bank or credit cards to swipe open ticket barriers from today.
The Rightmove September House Prices survey is out today, revealing how house prices are changing in every London borough.
TfL has announced plans to redevelop 55 Broadway, the historic home of London Underground. But the plans are under fire from Labour.