John Stevenson: We all accept that circumstances change and threats will change over time. Is there a time limit to these changes? Is there a specific date when they will be reviewed?
Chris Grayling: On time limits, the change will be implemented from now by the airlines; they are being asked to have the changes in place within a very short period. Clearly, they will have a job to do, as we will, to communicate to people who are returning and will be affected by this. The airlines are very seized of the need to do that well. We all hope that these are temporary measures, but we will keep this under review and we will keep them in place for as long as they are necessary to secure the safety of our passengers.