My hon. Friend is absolutely right to stress that point.
At least three British citizens are detained in Iran. I have heard that a fourth person, whose name I do not know, has also been detained. We will have to see who that person is. Those four people stand in great contrast to the four Americans who were released from Iranian prisons in 2016 as part of a prisoner swap that came about following the Iran nuclear agreement. Nothing similar has occurred with regard to those Britons who have been detained in Iran over the same period.
In the few seconds I have left, I make the point that the hon. Member for Hampstead and Kilburn fully identified the reasons why we need those people released. It is fine to hear warm words from the Foreign Secretary and the Prime Minister, but we need to see action on those words. We need a real release of prisoners from Iran as quickly as possible.