Could Iran strike the UK?

The targeting of Iranian missiles at the Diego Garcia UK-US military base on Friday has sent alarm bells ringing in Europe. Diego Garcia is over 2,500 miles (4,000km) from Iran and, if a missile from Tehran can reach there, it could also reach Paris, Berlin or even London.

“Previously, we thought Iran’s missiles had a range of 2,000km (1,245 miles),” General Sir Richard Barrons, former commander of Joint Forces Command, told BBC Radio 4 on Saturday.

One of the missiles fell well short of its target and the other was shot down...