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Nearly one in five voters want Theresa May to call another General Election.

And that rises to nearly a third in the 25-34 age group. A quarter of voters in South East Tory heartlands also favour her going to the country again.

An exclusive ComRes survey for the Sunday Mirror held after the PM’s big Brexit speech on Friday showed 19 per cent of voters wished she’d announced going to the polls.

They want a chance to vote on whether the UK should pursue the PM’s wishy-washy vision of Brexit or to make Jeremy Corbyn PM so he can negotiate a new customs union with the EU.

Mrs May has ruled that out because she claims it would put tariff restrictions on trade deals the UK could strike with the rest of the world.

(Image: Getty)

But the Labour leader also got a lukewarm response for his plan to tie Britain to a new customs union with 19 per cent saying he should rule it out and 18 per cent backing him.

Men are almost three times more likely as women to be against joining a customs union.

More than one in ten voters say Mr Corbyn should have committed Labour to a second Brexit referendum, rising to 17 per cent of North West voters and 23 per cent in Wales.

And 15 per cent want him to keep Britain in the EU single market which means unlimited EU migration into the UK. One in five Scots say they want to stay in the single market.

(Image: Getty)

With less than eight months to go before Mrs May has to agree a deal with EU partners at October’s European Council summit, only eight per cent of Brits say they are more optimistic about Brexit now than they were a year ago.

On BBC’s Andrew Marr show tomorrow morning, Mrs May will deny her vision is blurred.

She will say: “I was setting out an ambitious vision of the future economic partnership we want the UK to have with the EU once we’ve left.

“It was practically based, and therefore, a credible vision. I was being straight with people.”

(Image: PA)

But speaking in Southampton today, shadow Chancellor John McDonnell said: “We want a close, co-operative relationship after Brexit with our closest trading partners and longstanding allies.

“We don’t believe in pulling up the drawbridge at Dover and peering out at the rest of the world.”

If there was another referendum on EU membership, Brexiteers are three points ahead of Remainers, almost the same as the 2016 result.

Three in a hundred voters say they would spoil their ballot paper in protest at being asked the same question again.

The message from voters to Mrs May in our poll is: “Get on with it.”

A third say she should keep hammering away at the EU to get the best deal for Britain, compared to one in ten who want her to quit to make way for someone else.

(Image: Getty)

That rises to 16 per cent of 35-45 year olds and 18 per cent of voters in the North East think she should go.

One in ten 18-24 year olds say Mrs May should make another speech to clarify the one she just delivered.

But 22 per cent said Mrs May should tell Brussels we’ve had enough of being messed about and Britain will leave without a deal.

The rises to a quarter among voters in East Anglia.

Fewer than one in ten voters have a better opinion of the PM following her Mansion House speech compared to 13 per cent who now think more of Mr Corbyn.

Interventions last week by former PMs Sir John Major and Tony Blair show 12 per cent of voters have a better opinion of Tory Sir John while only four per cent could say the same of Labour’s Mr Blair.

(Image: Getty)

Mr Blair is least popular among those aged over 65. Six in ten say their opinion of him is worse.

A free trade deal with the EU remains the top priority for voters with 30 per cent opting for it ahead of doing business elsewhere, curbing EU migration, or being free to make our own laws.

More than two in five 18-24 year olds say free trade with Europe is the most important goal of Brexit while 28 per cent of East Midlanders say it should be trade with the rest of the world.

A quarter in this region also say controlling immigration should be the priority.

Only seven per cent of those questioned thought an open border between Northern Ireland and the Republic should top the list.

Q. Considering the last week and the speeches they have made on Brexit, has your opinion of the following people got better, worse or stayed the same?

Better JC: 13% TB: 4% TM: 9% JM: 12% Stayed the same 45% 39% 52% 37% Worse 29% 37% 27% 27% Don't know 13% 20% 12% 24%

JC = Jeremy Corbyn, TB = Tony Blair, TM = Theresa May, JM = John Major

Q. Following Theresa May's speech today, which of the following do you think that she should do?

Statement % Carry on negotiating with the EU to get the best deal for Britain 33% Tell the EU we've had enough and Britain will leave without a deal 22% She should call a General Election so voters can decide whether they support the Labour or Conservative position on Brexit 19% She should resign to make way for someone who is up for negotiating Brexit 11% She must make another speech as today's did not clarify a lot 5% None of the above 10%

Q. The EU customs union is an agreement between EU member states and other countries to establish a trading group with external tariffs, making internal trade easier and cheaper. The EU single market refers to the free movement of goods and services within the EU. Jeremy Corbyn says Britain should stay in a permanent customs union with the EU to ensure the free flow of trade across the Irish border. Do you think ...?

Statement % He should have ruled out a permanent customs union with the EU 19% He has the right approach to Brexit 18% He should have said nothing and let the Conservatives fight it out between themselves 16% He should have gone further and said Britain should also stay in the single market as well as the customs union 15% He should have committed Labour to a second referendum on whether to stay in the EU or not 12% None of the above 20%

Q. Are you more or less optimistic about the process of leaving the EU than you were at this time last year?

Optimism % More optimistic 8% About the same 47% Less optimistic 37% Don't know 8%

Q. What should our Brexit top priority be in getting the best deal for Britain?

Statement % A free trade deal with Europe 30% The freedom to strike free trade deals with the rest of the world 22% Control of our borders to curb EU migration into the UK 21% The freedom to make our own laws without Brussels interference 20% An open border between Northern Ireland and the Republic of Ireland 7%