In further signs of economic fallout from last week's shock vote, the government also warned that Britain will likely abandon a key promise to achieve a budget surplus by 2020, while no-frills airline EasyJet announced contingency plans to ensure its European operations after Brexit.
Britain has been plunged into extraordinary political turmoil since Britons voted by 52 per cent in favour of leaving the European Union, with the ruling Conservatives and opposition Labour party in disarray and the country deeply polarised.
Justice minister Gove, who torpedoed fellow anti-EU campaigner Boris Johnson's leadership hopes yesterday, also said he would pull Britain out of the single market, end free movement of people and impose a new immigration system favouring skilled workers.
Gove's rival and the current favourite in the race, Theresa May, had said yesterday that Article 50 "should not be invoked before the end of the year".
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"The decision has been taken, it cannot be delayed and it cannot be cancelled, now they have to face the consequences," Hollande said on the sidelines of Battle of the Somme centenary ceremonies in France.
He said a speedy Brexit "would avert all the uncertainties and instability, especially in the economic and financial domains. The faster it goes, the better it will be for them".
Highlighting the uncertainty the "Leave" vote has created for business, easyJet said it was trying to acquire a certificate to operate in a European country "to enable EasyJet to fly across Europe as we do today".