Dr Julian Lewis: Can the Minister tell the House roughly how many British dual nationals are being held captive in Iran, and how many of them chose to go there after the ordeal of this poor lady [Nazanin Zaghari-Ratcliffe] began so many years ago? What advice would he give to any British dual nationals thinking of going to Iran in the future?

[The Minister for the Middle East and North Africa (James Cleverly): The UK travel advice on Iran has remained consistent for some time. We strongly advise against all travel to Iran. Our ability to offer consular support, for the very reasons that we have discussed here, is severely limited. My right hon. Friend will forgive me if I choose not to disclose how many people we believe are in incarceration. Our view is that, while that might be frustrating to many, it is sometimes better that we exert the pressure that we exert quietly, rather than publicly.]