Sir Iain Duncan Smith, the former Tory leader, said it was vital Mr Frost continues to champion UK sovereignty in the talks, as the issue was fundamental to many Brexit voters.

The Brexiteer highlights this in a recent Express.co.uk comment piece, where he points out most people who voted to leave the EU did so to return sovereignty to the UK.

The Tory MP said a poll conducted by Lord Ashcroft on the day of the 2016 EU referendum found nearly half of leave voters said the biggest single reason for wanting to leave the EU was the principle that decisions about the UK should be taken in the UK.

The survey found only a third said the main reason was to regain control over immigration and its own borders.

When discussing the current trade talks, Sir Iain wrote: Importantly, David Frost, Boriss chief negotiator made it clear he agreed when he wrote that in the negotiations, the UK places sovereignty above all else.

It is in that context that the issue of how these outstanding payments to the EU impinge on the UKs sovereignty which matter now.

The Brexiteer urges Mr Frost to walk away from the talks if the UKs sovereignty risks being impinged.

He said: The WA was always work in progress as at the end of this year, the UK has a right to a comprehensive agreement, one which treats the UK as a sovereign partner.

A failure to observe this must lead to a rejection of the WA.

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9.33am update:Brexit Britain could form NEW superpower alliance with Australia, Canada and New Zealand

Brexit Britain could form a federation with Canada, Australia, and New Zealand to create a superpower" after fully cutting ties with the EU, a historian has claimed.

Historian Andrew Roberts described the federation of nations whose majority of people speak English could be a free trade zone with the free movement of people.

The idea is based on the concept of the "CANZUK Union", this being the acronym for Canada, Australia, New Zealand, and the United Kingdom.

The union could have a mutual defence organisation and combined military capabilities, the historian claimed.

According to Mr Roberts, the "CANZUK" union would be the fourth-largest economy in the world.

9am update:FTSE-100 shares rose on hopes of Brexit deal

London-listed shares rose on Monday, due in part to renewed hopes of a Brexit trade deal with the EU.

The FTSE-100 was up 0.8 percent, with the mid-cap FTSE-250 also up 0.7 percent - a seven-week high.

Traders are hopeful of a Brexit trade deal after Britain's top minister overseeing negotiations said on Friday he was confident of an agreement with the EU.

Stocks also rose in response to optimism around a post-pandemic economic rebound in China.

8.07am update:Ireland must take a long hard look at Brussels membership

Ireland has been tipped to follow the UK's lead and quit the European Union by a former Irish diplomat who called for "a long hard look" at whether the country's membership of the bloc was worth it.

Ray Bassett pulls no punches in his new book, 'Ireland and the EU Post Brexit', suggesting the benefits bestowed on Dublin by Brussels are drying up, with "difficult choices" on the horizon.

In his book, he writes: "We need a long hard look at our EU membership and pose the question, is it worth the price?"

"The billionaire businessman, George Soros, an ardent europhile, has accepted the inevitable and predicted that unless the EU reforms it will perish.

"The pipe dreams of Emmanuel Macron and his proposals for even a more centralised EU are vanishing against the cold reality of the desire for the citizenry of EU Member States for national sovereignty.

"The disastrous showing of the establishment centre-right and centre-left parties in the 2019 European Parliament elections demonstrated this in a very direct way."

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Brexit LIVE: David Frost urged to WITHHOLD UK repayments 'Sovereignty above all else!' - Daily Express