5 things to know about the final UK election TV debate Boris Johnson and Jeremy Corbyn faced their final live debate of the general election campaign.

LONDON — Boris Johnson and Jeremy Corbyn clashed in their final head-to-head debate of the U.K. general election campaign on Friday.

Less than a week before polling day on December 12, the Labour and Conservative leaders faced off in Maidstone, Kent for an hour. A snap YouGov poll after the debate found 52 percent of viewers thought Johnson won while 48 percent thought Corbyn did. But the close result is within the margin of error, meaning a score draw.

Here are the five things you need to know.

1. A diplomat quit with a blast at Boris Johnson and he didn't notice

The prime minister claimed to know nothing about the senior U.K. diplomat who quit her job saying she no longer wanted to “peddle half-truths” about Brexit for the British government. Alexandra Hall Hall, the lead envoy for Brexit at the U.K. Embassy in Washington, handed in her resignation on December 3. She said the British civil service was being asked to deliver messages on Brexit which were not "fully honest" and her position had become "unbearable personally" and "untenable professionally."

The story broke several hours before but asked about it during the debate, Johnson said: “I don’t know who you are referring to but what it shows to me is that we need to move on as a country.”

2. Both leaders were on message (a little too on message)

Johnson managed to shoehorn his core campaign message about the need “get Brexit done” into just about every question he answered. He said his opponent’s record on dealing with anti-Semitism in Labour ranks showed a “failure of leadership,” and likened it to Corbyn choosing to stay neutral in a future Brexit referendum.

Meanwhile, Corbyn insisted on pulling the conversation back onto the past decade of Conservative austerity and remind viewers about his plans to pump cash into public services.

3. Corbyn mooted an independent election lies monitor

One member of the audience asked what punishment party leaders should face if they are found to have lied during an election campaign.

Johnson did not miss the opportunity to make a quip. “They should be made to go on their knees down through the chamber of the House of Commons, scourging themselves with copies of their offending documents which claim to prove one thing and actually prove something quite different," he said.

But taking aim at the Vote Leave campaign's widely disputed claim about increased funding for the NHS after Brexit, Corbyn said: “When people paint slogans on the side of a bus that are totally unsustainable perhaps it is time that we do have an independent monitoring of what goes on in elections.”

4. Corbyn promised not to disband MI5

Johnson repeated the charge that Labour's Shadow Home Secretary Diane Abbott once called for “the abolition of conspiratorial groups like MI5 and Special Branch." But Corbyn insisted: “There are no plans whatsoever to disband MI5 or any other part of the security services.”

The Labour leader was also forced to clear up confusion about whether Labour would impose a 4-day week on NHS staff.

The party has promised to reduce the number of hours worked from 37.1 hours in the average working week down to 32 hours by 2030, with no loss of pay. Shadow Chancellor John McDonnell said earlier in the campaign that the policy would apply to “everybody” including NHS staff, though Shadow Health Secretary Jon Ashworth said the opposite.

But Corbyn said during the debate: “There is no plan to bring in a four-day week in the NHS.”

5. Nobody agrees about Brexit (still)

The two leaders clashed repeatedly over Brexit. Corbyn brought up the leaked U.K. Treasury assessment he revealed earlier on Friday which outlined the possibility that businesses exporting from Great Britain to Northern Ireland would be subject to customs checks, contrary to claims by Johnson. But the prime minister insisted: “It says unfettered access, I think is what it says.”

Corbyn also repeated his claim that Johnson wants to include the NHS in a trade deal with the U.S. Johnson said the assertion was “Bermuda triangle stuff,” adding: “We’ll be hearing about little green men next.”

And when Corbyn said a trade deal with the U.S. would take seven years to negotiate, while the U.K. still risked leaving the EU with no deal at all, Johnson accused him of showing a “slight ignorance in the reality.”

UK NATIONAL PARLIAMENT ELECTION POLL OF POLLS

For more polling data from across Europe visit POLITICO Poll of Polls.