Over the last few years, thieves have targeted war memorials in Enfield, Lewisham and Surrey.
Brass plaques were ripped off the war memorial in Carshalton last year, apparently taken for their scrap metal value.
They were eventually replaced thanks to a £20,000 donation from a scrap metal dealer, who had been outraged by the theft.
The garden of remembrance at Broomfield Park in Enfield was also attacked in 2009.
In total, 16 brass plaques - containing the names of 15,000 war dead - were wrenched off the walls of the monuments.
More top news
Hundreds of people do no know when they will be allowed back home after a 'serious incident' was declared in east London.
A Tube and rail strike planned for Wednesday evening could bring the capital to a standstill causing travel chaos for millions of commuters
The only Muslim survivor of the 7/7 terror attack in London has urged the country to stand together against Islamophobia.