How serious is the threat of energy shortages?

The consequences of the Iran war for the UK economy are more about higher energy prices than energy shortages. That said, 12% of the UK's diesel imports and 63% of its jet fuel imports come from the Middle East. So unless this afternoon's reported reopening of the Strait of Hormuz means trade starts flowing through it quickly, there is a real risk at some point of diesel becoming harder to find and some flights being cancelled.