I am grateful to the hon. Lady for continually giving way as it allows us to develop some of the points.
This power already exists. Our authorities have the ability to stop people at our borders and airports who are suspected—or not even suspected—of terrorist offences. We discussed on Second Reading—and I engaged with the Minister subsequently on this point—how Border Force often uses the power erroneously against British citizens travelling from Belfast to Birmingham, for example, or from Glasgow down to Birmingham or London, and so on. It is not appropriate. I hope in this debate to get a sense that there will be some restrictions on a power that is worthwhile and useful from a terrorist prevention perspective, but which is being used improperly and erroneously.