Border security

Shocking security flaw means terrorists could travel from Europe to Britain PASSPORT FREE

The loophole on the Eurostar allows foreigners to board a train within Europe without showing any ID, before travelling on to Lille in France.

And as they travel onwards to Britain, which is not in the Schengen zone, passports are rarely ever checked, an investigation found.

Trains between Brussels and Lille do not require ID after the visa-free travel arrangements were implemented, although anyone travelling on to Britain should be stopped under the regulations.

France and Belgium, as well as 26 European states, and a few non-European, have abolished border control under the Schengen agreement, allowing visa-free travel.