Birmingham would be the second most damaged city in Britain by a hard Brexit , new research has revealed.

The city's economy would lose £6.82 billion over five years.

This is a fall in economic output of 5.5%.

The figures, published by the respected Centre for Economic Performance at the London School of Economics, show how much the city's economy would shrink if the UK left the European Union without a deal giving us full access to the Single Market and the Customs Union.

This is the so-called "no deal" Brexit.

The UK would lose £430 billion over five years, and the only place to suffer more than Birmingham would be London.

In practice, it means businesses would do less work and employ fewer people.

Prime Minister Theresa May has said she is determined to get a deal by the time Brexit takes place in March 2019.

But the Government has also admitted that leaving without a deal is possible.

Liberal Democrat leader Sir Vince Cable says the UK should stay in the Single Market

Liberal Democrat leader Vince Cable has seized on the figures to say ministers should commit to staying in the single market and customs union for the sake of Birmingham’s economy.

He told the Birmingham Mail: "This work by the London School of Economics brings out the extent to which Birmingham would be seriously damaged economically by a no-deal Brexit.

"These economic modelling exercises are necessarily approximate, but if anything they understate the damage once we take into account the knock-on effects. And the damage to cities such as Birmingham will hit the whole of the UK because it is so central to Britain’s prosperity.

"The government must guarantee our membership of the single market and customs union. This is precisely why the Liberal Democrats, alone among political parties, are campaigning for an exit from Brexit by offering the people a vote on the final deal.

"If the government dispute the figures then I challenge them to publish their own figures which so far they are refusing to do by sitting on studies they have undertaken. Until they do, these are the most authoritative figures available."

International Trade Secretary Liam Fox insisted the UK would press ahead with a "no-deal" Brexit if need be, when he spoke on ITV's Peston show on Sunday.

It would mean the UK traded with the EU using rules set out by the World Trade Organisation (WTO). There would be tariffs on goods exported between the EU and UK, and delays at borders as customs checks took place.

Mr Fox said: "If we have no deal and we trade on current WTO terms, that’s the basis not only that Britain trades with countries like the United States, but that the EU trades with the rest of the world in most circumstances.

"So it’s not exactly a nightmare scenario."

Chancellor Philip Hammond

Chancellor Philip Hammond has revealed the Government has produced "models" showing how different regions of the UK will be affected by Brexit - but the Government says it won't make them public.

MPs are demanding the publication of the findings, which also include an analysis of the impact on different sectors of the economy.

A letter to Brexit Secretary David Davis calling for publication has been signed by 120 MPs, including Adrian Bailey (Lab West Bromwich West), Liam Byrne (Lab Birmingham Hodge Hill), Jack Dromey (Lab Birmingham Erdington), Preet Gill (Lab Birmingham Edgbaston), Shabana Mahmood (Lab Birmingham Ladywood), Khalid Mahmood (Lab Birmingham Perry Barr) and Jess Phillips (Lab Birmingham Yardley).

But an opinion poll has found there is some support for walking away from the EU without a deal if need be.

A survey by Opinium found 37% backed leaving without a deal if no agreement could be reached, while 25% supported a transition period where the UK stays in the single market and 23% backed abandoning Brexit altogether.

Labour Shadow Brexit Secretary Keir Starmer has said Labour will work with rebel Tory backbenchers to ensure Parliament has the power to veto any Brexit deal. This could include vetoing plans to leave without a deal.

However, it's unclear what would happen if Parliament did reject the Government's Brexit plans. The UK has already told the EU it is leaving by March 2019 and it's unclear whether that process would automatically stop if Parliament votes for a pause.