The Tower of London is a world-renowned iconic castle and World Heritage Site, built by William the Conqueror in 1078, and has served as a Royal Palace, a fortress and a prison over the centuries.
Other Historic Royal Palaces include Hampton Court Palace, Banqueting House, Kensington Palace, Kew Palace and Hillsborough Castle.
Commenting on the contract award, Westminster's Chief Executive, Peter Fowler, said:
"I am delighted our Services Division has been awarded this important new contract expanding the scope of our services to the Historic Royal Palaces.
“This latest contract award demonstrates we have the reputation, skills and resources to secure and successfully deliver high profile contracts around the world.”