The British and an Irish passport - how many are entitled to one?

An estimated 6.7 million may be entitled to receive one

An Irish passport has recently become a valuable commodity across the pond as the confusion over post-Brexit conditions are yet to be confirmed.

There is no indication when Article 50 will be triggered which has left the E.U. in a state of uncertainty regarding its future relationship with Britain.

In turn, the British public don't know the full cost of "taking back control" of their borders as their free travel arrangements in the E.U. may well be coming to an end.

This could well lead to a surge in applications for Irish passports which entitles holders to all the benefits of being an E.U. citizen including unrestricted travel throughout the member states.

According to the BBC, in the 2011 British census roughly one in 100 people ticked the "White Irish" box when describing their ethnicity.

Any Briton who has a grandparent born on the island of Ireland is entitled to apply for and carry an Irish passport.

Referencing data published in 2001, and allowing for family expansion, the BBC estimate there are roughly five million second and third generation Irish people living in Britain.    

There are 650,000 first generation immigrants on the British mainland but only 250,000 aren't in possession of an Irish passport. 1.3 million people in Northern Ireland also don't have one.

A conservative estimate would indicate that there are at least 6.7 million people in the UK who are entitled to an Irish passport.

In 2015 some 51,412 applications were received through the London passport office, and 49,43 through the Northern Ireland service.  That figure could increase dramatically over the coming months and years.