More than 50 years after its discovery on Scotland’s Isle of Skye, scientists have unveiled a monster that would make Nessie blush: a 13-foot-long reptile that ruled the seas 170 million years ago.

West of Glasgow, the peninsula of Argyll stretches towards its cluster of neighbouring isles, which fan out in all their marvellous diversity. Although small on the map, this part of Scotland has more ...