Transport staff will record details of all travellers leaving by commercial air, sea and rail transport.

The exit checks will particularly affect travellers on cross-channel ferries and the Channel Tunnel.

For the first month all passports will be scanned but only 25% of the passport holders will have their details verified to ensure they are genuine, in a bid to minimise disruption.

After a month, there will be a move to 50% verification and by the middle of June 100% verification will be introduced.

Source: BBC