A British-flagged oil tanker was seized by Iran on Friday night and was heading towards a Revolutionary Guard base, in a major escalation of tensions along one of the world's most vital oil shipping routes. The Stena Impero had been en route to Saudi Arabia but made an abrupt change of course and began moving towards the Iranian island of Qeshm, according to data relayed by maritime tracking services. The ship “went dark”, meaning its identification system was turned off, at 16:29 UK time and nothing has been heard from her or her 23 crew since. Northern Marine, a Clyde-based...