Britain has introduced a stringent exit procedure at seaports, airports and tunnels which will see all travellers' passports thoroughly verified before a person can leave the UK.Data collected on those leaving the UK will be handed over to the Home Office, which says it will improve its ability to identify and further tighten the immigration routes and visas that are most vulnerable to abuse.An original deadline of 1 April for the introduction of 100% exit checks on the 100 million passengers who leave Britain each year was delayed due to fears of travel chaos over the Easter bank holiday.The UK immigration minister, James Brokenshire, said on Wednesday: “Exit checks introduced at ports today will provide vital information to confirm a person's exit from the UK and help combat visa abuse. Exit checks will provide a clearer picture of who is leaving the UK and who is staying in this country when they have no right to be here.”In the project's first month, all passports will be scanned, but only 25% of passport holders will have their details verified.In the second 50% will be checked, and by the middle of June, 100% of passports will be fully checked.Exit checks were scrapped in 1998, but brought back in as part of the Immigration Act passed by Westminster in 2014.