Donald Trump has reinstated a US blockade of Iranian ships in the Strait of Hormuz and demanded a 20 per cent fee on all other cargo passing through the chokepoint, declaring the United States "the Guardian of the Hormuz Strait". Hours later, Britain designated Iran's Islamic Revolutionary Guard Corps under a new National Security Act, moving it close to full terrorist proscription. The twin moves have pushed Brent crude above $80 a barrel and lifted **UK two-year gilt yields...