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.
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The man is believed to have suffered a fractured cheekbone.
The man, who was in his 30s, has not been identified, while several other people are believed to have suffered serious injuries.
If you're dreading going to work Monday morning, how about this for a career change.