After RAF Fairford incident, how big a threat to the UK is Iran?

Although there is scepticism about Tehran's capabilities, it has become clear it wants Britain to feel it poses a risk

Britain may have been only peripherally involved in the bombing of Iran that Donald Trump and Benjamin Netanyahu started, but in the past fortnight it has become clear that Tehran wants to pose a threat inside the UK in response.

In the aftermath of the confused incident near RAF Fairford, western officials are weighing up whether to warn publicly that Iran now has US military targets in Europe on its mind, such as the air force base in Gloucestershire.