The leading British consumer group Which? has warned that millions of UK travellers could be barred from entering many European countries in the event of a no-deal Brexit unless they renew their passports by Friday.
According to Which?, British travellers risk falling foul of rules for entering countries in the Schengen zone such as France, Spain and Italy, according to Which?.
Figures obtained by Which? show that around 3.5 million current British passports will not comply with the validity rules.
Until recently, UK citizens who renewed their passport before it expired could have up to nine months of the remaining validity added to their new travel document.
But this time the British Government has warned carried over will not count towards the six-month requirement after a no-deal Brexit, meaning people with up to 15 months left on their passport could be denied entry to many popular destinations on the continent.
The consumer group noted that Friday will be three weeks before the UK is due to withdraw from the EU, which is the time it takes for passports to arrive after a standard renewal application.