Brexit campaigners who argue the UK could get a better trade deal with Europe outside of the EU are “economically illiterate” and dishonest, the Chancellor has claimed.

Singling out London Mayor Boris Johnson for advocating a “Canada-style” deal with Europe, which a Treasury analysis will claim would cost every UK household £4,300 by 2030, George Osborne said it was “not credible” to think Britain could maintain all the benefits of EU membership with none of the obligations.

His intervention came ahead of the publication of the Treasury’s assessment of the economic implications of EU membership and the likely impact of Brexit.

The analysis is expected to say the UK economy would be six per cent smaller by 2030 under a Canada-style deal, and to predict that all alternative deals would also be bad for the country's finances, taking billions out of public spending.

The claims have been dismissed by Leave campaigners as politically motivated.

What's the European Parliament ever done for us? Show all 5 1 /5 What's the European Parliament ever done for us? What's the European Parliament ever done for us? A cap on the amount of hours an employer can make you work The Working Time directive provides legal standards to ensure the health and safety of employees in Europe. Among the many rules are a working week of a maximum 48 hours, including overtime, a daily rest period of 11 hours in every 24, a break if a person works for six hours or more, and one day off in every seven. It also includes provisions for paid annual leave of at least four weeks every year Getty Images What's the European Parliament ever done for us? Helping the people of Britain to avoid smoking In 2014 MEPs passed the Tobacco Products Directive strengthening existing rules on the manufacture, production and presentation of tobacco products. This includes things like reduced branding, restrictions on products containing flavoured tobacco, health warnings on cigarette packets and provisions for e-cigarettes to ensure they are safe What's the European Parliament ever done for us? Helping you to make the right choices with your food Thanks to the European Parliament, UK consumers have access to more information than ever about their food and drink. This includes amount of fat, and how much of it is saturated, carbohydrates, sugars, protein and so on. It also includes portion sizes and guideline daily amount information so people can make informed choices about their diet. All facts must be clear and easy to understand What's the European Parliament ever done for us? Two year guarantees and 14-day returns policy for all products Consumers across the EU have access to a number of rights, from things which are potentially very useful, to things which used to be annoying. For example, shoppers in the UK receive a two-year guarantee on all products, and a 14-day period to change their minds and return a purchase, these things are useful www.PeopleImages.com-licence restrictions apply What's the European Parliament ever done for us? Keeping your air nice and fresh (and safe) Believe it or not, although the situation is improving, some areas of the UK have appalling air quality. A report by the Royal College of Physicians released on 23 February says 40,000 deaths are caused by outdoor air pollution in the UK every year. Air pollution is linked to a number of illnesses and conditions, from Asthma to diabetes and dementia. The report estimates the costs to British business and the health service add up to £20 billion every year

The Eurosceptic Conservative MP John Redwood said the Treasury’s document was “absurd”, criticised Government officials for having “degenerated” to the point of producing it, and suggested that those warning of the possible economic costs of Brexit were in a "conspiracy to get us to stay in the EU”.

However, speaking to BBC Radio 4’s Today programme, Mr Osborne staunchly defended the Treasury’s analysis and launched his strongest attack yet on the arguments put forward by the Leave campaign.

He said he rejected “the idea that Britain can sign up to some kind of deal where we get all the benefits of EU membership but none of the obligations or costs.”

Osborne: Britain "poorer outside EU"

“The Germans or French wouldn’t give that to us because it’s a better deal than Germany or France get,” he said. “It’s not credible. You completely misunderstand Britain’s negotiating hand if you think we could get a better deal than France or Germany.”

He added: “There are some people in this debate who say: ‘you know what, it’s a price worth paying, I know there will be a hit to economy but we’ll pay that price so Britain can go it alone’.

"At least that’s an honest debate. What is not honest and what is economically illiterate is to say we can have all the economic benefits of being in the EU and at the same time leave – that is having your cake and eating it.”

However, Mr Redwood, also appearing on the Today programme, said Britain would be better off outside the EU, but that the Leave campaign could not present “precise figures” because it was “worthless” to make economic forecasts up to 2030.

Pointing out that Treasury projections had been wrong in the past, he said: “I and others have talked to the German government – who are the leaders in all this – and Germany has made it very clear that they do not want new barriers in the way of their very successful export business to Britain.”

Challenged over the evidence of the falling value of sterling, which the Bank of England has blamed on uncertainty around the EU referendum, Mr Redwood said that no-one had linked the benefits of falling borrowing costs to Brexit.