Trinidad
From Tardis Wiki, the free Doctor Who reference
Trinidad was a place on Earth.
Malcolm's parents were from Trinidad, but Malcolm himself was born in Britain. (PROSE: Time and Relative)
Peter Moore was a second-generation Trinidadian. (PROSE: Invasion of the Cat-People)
Behind the scenes
Trinidad is an island in the Caribbean. Together with Tobago, it forms the nation Trinidad and Tobago.
T&T gained independence from Britain in 1962, less than a year before the events of Time and Relative. After this, they remained part of the Commonwealth, allowing for easier migration to the UK than elsewhere.