* Brexit takes centre stage in final debate
* Latest poll has Conservatives nine points ahead
* Labour doubles down on attack over Johnson's deal
(Adds more comments, snap poll)
By Elizabeth Piper and Kylie MacLellan
MAIDSTONE, England/LONDON, Dec 6 (Reuters) - Prime Minister
Boris Johnson and opposition Labour leader Jeremy Corbyn clashed
over Brexit on Friday in the last televised debate before next
week's election that will determine the path for Britain's
departure from the European Union.
Six days before Britain votes in its second national
election in less than three years, the debate was seen as the
last chance for Corbyn to squeeze Johnson's lead in the polls,
which mostly point to victory for the prime minister.
A snap poll by YouGov found 52% of viewers thought Johnson
had won the debate.
The two leaders set a combative tone over how to leave the
EU and in their very different offers for domestic policy -
"socialism carried out in a democratic way" from Corbyn, or
"one-nation Conservatism" that will not "rack up debts" from
Johnson.
More than three years after Britain voted to leave the EU,
the Dec. 12 election will determine when, how and even whether
Brexit happens.
Johnson ridiculed Corbyn's support for a new referendum in
which Corbyn has said he would remain neutral, while the Labour
leader said the prime minister's pledge to "get Brexit done"
actually meant years of trade talks.
"We have ample time to get on and build a new free trade
partnership, not just with the EU but with countries around the
world," Johnson said in the BBC television debate.
But Corbyn countered that it would take the government seven
years to negotiate a trade deal with the United States and said
business could not live with the uncertainty that Britain might
still leave the EU without a deal next year.
Polls show Johnson's governing party is well ahead of
Labour. A Panelbase survey on Friday showed the Conservatives
extending their lead slightly over the opposition party to nine
points, up from eight a week ago.
Johnson, who renegotiated a new divorce deal with the EU in
October, has promised to "get Brexit done", a slogan he has
repeated constantly during campaigning to try to win over Labour
supporters who backed leaving the bloc, and those who are simply
fed up of the political haggling over the issue.
Britons voted by 52%-48% in 2016 for Brexit but parliament
has been stuck in deadlock over the way forward. If Johnson wins
the majority he says he needs, Britain will leave by Jan. 31 and
then seek to secure a trade deal with the bloc by the end of
2020.
DAMAGING DOSSIER
Keen to land a blow, Corbyn doubled down on an earlier
attack on Johnson, calling his Brexit promises a fraud and
saying his deal would simply be the start of years of "painful
negotiations and broken promises".
The Labour leader waved at him documents he had unveiled
earlier in the day, which he said showed the divorce deal would
lead to customs declarations and security checks between Britain
and Northern Ireland, a direct contradiction of Johnson's
statements that it would not create any barriers.
"How about the prime minister showing a degree of honesty
about the arrangements he's actually made with Northern
Ireland," Corbyn said. "It is a question of openness."
Johnson said the document was "complete nonsense" and his
team said they believed he had weathered the attack
successfully.
Both were taken to task over accusations of prejudice in
their parties, and questioned over their approaches to Britain's
much loved public health service and their stance on security, a
week after another terror attack hit the capital.
But with less than a week until the election, it looks as
though many people are still undecided and the Conservative
lead, so far, intact.
Sterling this week hit a 2-1/2-year high versus the euro and
a seven-month high against the dollar on expectations that the
Conservatives will win the election.
"Given the Conservatives went into this debate in the lead,
they will hope the lack of a knockout blow means they can
maintain this until voting day," said Chris Curtis, YouGov's
Political Research Manager.
(Additional reporting by Paul Sandle, William Schomberg and
Andrew MacAskill; writing by Elizabeth Piper and Michael Holden;
Editing by Giles Elgood and Rosalba O'Brien)