Union Jacks and red post boxes can still be found in some of the most remote, inaccessible places on the planet - the far-flung islands still governed by Britain. Ben Fogle, pursuing a childhood dream, has travelled to meet the inhabitants of these wild places with evocative names like Tristan da Cunha, Ascension, Diego Garcia and Pitcairn. Because of his own unique experience on Castaway he's been welcomed by these isolated, patriotic communities. And along the way he's been threatened by elephant seals, chased by the Royal Navy and deported for spying.