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Less than one in 10 Britons feel more optimistic about Brexit than a year ago, a poll suggests.

Just eight per cent of voters felt the outlook for Britain's withdrawal from the EU had got better nearly a year after Theresa May triggered Article 50, while more than a third (37 per cent) felt less optimistic about it, and 47 per cent did not change their view, the ComRes/Sunday Mirror poll showed.

And it appears many voters were turned off by high-profile interventions this week from the Prime Minister, Jeremy Corbyn, Tony Blair and Sir John Major.

The big-hitters all made major speeches on Britain's withdrawal from the EU this week, and while they did not change most voters' opinion, more were turned off than enthused, according to ComRes's poll of 10,96 adults.

Less than one in 10 (nine per cent) had a better opinion of Mrs May after she set out her Brexit vision, while more than a quarter (27 per cent) said their impression of her had got worse.

But most voters backed her strategy of continuing to negotiate with the EU (33 per cent) to get the best exit deal for Britain, while less than a quarter (22 per cent) said she should walk away from talks.

Less than one in five (19 per cent) called for another general election so voters can choose between the Labour and Tory positions on Brexit.

Her Mansion House address was preceded by Mr Corbyn's speech setting out Labour's backing of a customs union with the EU.

But it left more than a quarter (29 per cent) of voters with a worse opinion of the Labour leader, while 13 per cent said their view of him had improved.

In a damning assessment of his strategy, more people thought he should have ruled out a customs union (19 per cent) than backed his approach (18 per cent).

But illustrating the difficult balancing act he faces uniting Labour Leave and Remain voters, 15 per cent said he should have gone further and backed single market membership while 16 per cent thought he should have said nothing and let the Tories fight it out among themselves.

Overall, more voters think Britain's negotiating priority should be securing a free trade deal (30 per cent) than controlling borders to curb EU migration (21 per cent), while 22 per cent called on the Government to ensure the country has the freedom to strike free trade deals around the world.

One in five (20 per cent) said the priority should be the freedom to make our own laws without Brussels' interference (20 per cent), while only 7 per cent thought an open border between Northern Ireland and Ireland was key.

Additional reporting by the Press Association