British Prime Minister Boris Johnson said his failure to deliver Brexit last week as he had promised was a "matter of deep regret", but his deal remained to only way to get Britain out of the bloc.
"The only way out of the EU now, the only way to get Brexit done, is to go with the deal that we've got," he told Sky News in an interview at the start of his campaign for next month's election.
On the day Britain was supposed to have left the European Union, voters instead faced the start of an election campaign, with opposition Labour leader Jeremy Corbyn pledging to overthrow a "rigged system" he said was run by billionaires and tax dodgers.
After failing to deliver Brexit by the October 31 deadline, Prime Minister Boris Johnson called the December 12 election to break what he cast as a political paralysis that had thwarted Britain's departure and undermined confidence in the economy.
Opinion polls suggest the election is Johnson's to lose. His Conservative Party is leading Labour by 15 to 17 percentage points, according to Ipsos Mori and YouGov. Yet the overshadowing issue of Brexit, which has divided both major parties and their voters, could confound conventional calculations.
While Brexit frames the election, with Labour pledging to hold a second referendum on it, it is being fought by two of the most unconventional British politicians of recent years who offer starkly different visions for the world's fifth-largest economy.
Boris Johnson said his failure to deliver Brexit last week as he had promised was a 'matter of deep regret'.