29th century

In the 29th century, the Earth Empire continued to flourish. (DW: The Mutants) Solar flares 'roasted' Earth and humanity fled on spaceships until the sun stabilised. The UK populace (ruled by Liz Ten) fled on Starship UK with the help of the last star whale. (DW: The Beast Below)

The standard of craftsmanship in the century may have been very high, as the Fourth Doctor estimated that the later interior of the Nerva Beacon had originally been built in the late 29th or early 30th century, which had been left mostly alone for at least ten thousand years. (DW: The Ark in Space)