Castaway 2000 was a reality TV programme commissioned by the BBC

BBC

The British Broadcasting Corporation is a British public service broadcaster. Its headquarters is at Broadcasting House in the City of Westminster, London. It is the largest broadcaster in the world, with about 23,000 staff...

 in 2000.
Castaway 2000 is a successful British television show that, because it was aired in the same year that Survivor first aired in the United States and Big Brother first aired in Great Britain, is often regarded as a reality show. The show follows a year-long effort by thirty-six men, women and children from the British public to build a community on Taransay

Taransay

Taransay is an island in the Outer Hebrides of Scotland. It is famous for being the host of the British television series Castaway 2000. Uninhabited since 1974, except for holidaymakers, Taransay is the largest island in Scotland that lacks a permanent population...

, a remote Scottish island in the Outer Hebrides

Outer Hebrides

The Outer Hebrides also known as the Western Isles and the Long Island, is an island chain off the west coast of Scotland. The islands are geographically contiguous with Comhairle nan Eilean Siar, one of the 32 unitary council areas of Scotland...

.
Billed as a bold experiment for the new millennium, the castaways were to build a sustainable self-sufficient community from scratch (apart from some buildings which were already there, and some which had been placed there for them).