48. Lundy Island
This National Trust-owned island, 12 miles off the coast of North Devon, "makes for a wonderful escape to a world free from cars, streetlights, TVs and mobile phones," says Dominic. "The wild moorland at the island's centre tumbles down valleys to secluded bays, where seals slumber on rocks and hoards of guillemots and puffins nest on dizzying clifftops." Though "you can walk across Lundy in under 10 minutes", it's worth staying for a long weekend.