Just to name a few:
The statue of Christopher Columbus situated in Belgrave Square Gardens, a gift to London from the people of Spain in 1992 to commemorate the 500th anniversary of Columbus's expedition to the New World.
At The Guards Crimean War Memorial is a statue of Florence Nightingale, a hero of that war.
Or, how about the statue of Yuri Gagarin, the Russian cosmonaut at the Royal Observatory in Greenwich, a gift to the British Council from the Russian space agency Roscosmos.