"Realistically, 2018 will be the last chance to secure a say on whether the new relationship proposed with Europe is better than the existing one," Blair said in an article published by his Institute for Global Affairs.
The former Labour leader said he passionately believes that exiting a powerful regional bloc is "an error the contemporary world cannot understand and the generations of the future will not forgive."
Blair said incumbent Theresa May’s Brexit plan has finally begun to take shape over the past several months, and once the alternative has been made known, Britons should be entitled to "think again," either through parliament, an election or through a fresh referendum.
A majority of Britons voted in the June 2016 referendum to quit the European Union. The Brexit date has been fixed for March 29, 2019.
