Osborne's ring fence will be made of cheese wire

Power to break up the banks.

So Osborne is going to "reset the banking system". A difficult thing to do with trust between Westminster and the banks at an all time low. How is he going to do it?

Well, first there's going to be a ring-fence: but it's to be not so much electrified as made of cheese wire - if banks don't respect it, regulators will be able to break them up.

It's not just about the fence though - he also plans to make the banking sector more competitive by making it easier to switch bank accounts, and by introducing a new regulator who'll aim to help out new competitors who want to enter the game. There are also talks over how consumer power can be increased, to hold the banks in check.

There is a plus side for the banks: the leverage ratio won't be changed beyond 1:33, but as might be expected, they have not taken kindly to the news:

Anthony Browne, the head of the British Bankers' Association said:

This will create uncertainty for investors, making it more difficult for banks to raise capital which will ultimately mean that banks will have less money to lend to businesses.

"What banks and business need is regulatory certainty so that banks can get on with what they want to do, which is help the economy grow. This decision will damage London’s attractiveness as a global financial centre.

"Uncertainty" isn't really the issue though - banks have been under changing regulation since 2008. The main problem for the banks will now be flexibility, according to Credit Suisse analysts (via FT Alphaville):

Reducing options to transfer capital and funding – As we understand it, banks will be under tight scrutiny to implement strictly a ring-fence. This will clearly limit the flexibility for banks when setting-up their ring-fence plans and limit options to transfer capital and funding. Although this is hard to estimate at this stage, this could increase the overall costs of the reform for the industry. We currently do not have an impact in our estimates.

If ring-fence is to work, it needs to be enforced - but as banks make their money by finding their way around such restrictions, a truly impenetrable fence'll cost. Here is a summary of the estimated hits to the economy via FT Alphaville:

Estimates costs from implementation – The draft legislation published in October 2012 highlighted the following costs for the broader industry and economy: (i) on-going costs of £2-5bn per annum, which compares to our total profit £26.1bn for the five listed UK banks in 2014E; (ii) one-off transitional costs of £1.5-2.5bn; (iii) negative GDP impact of 0.04-0.1%; (iv) reduced tax receipts of £150-400mn (this assumes all bank costs are passed onto the consumer); and (v) a reduction in the value of the government’s shareholdings in RBS and Lloyds Banking Group in the range of £2bn to £5bn relative to a ‘do nothing’ baseline scenario (compares to current value of £45.1bn).

If banks don't respect the fence, regulators will be able to break them up. Photograph: Getty Images
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PMQs review: Theresa May shows again that Brexit means hard Brexit

The Prime Minister's promise of "an end to free movement" is incompatible with single market membership. 

Theresa May, it is commonly said, has told us nothing about Brexit. At today's PMQs, Jeremy Corbyn ran with this line, demanding that May offer "some clarity". In response, as she has before, May stated what has become her defining aim: "an end to free movement". This vow makes a "hard Brexit" (or "chaotic Brexit" as Corbyn called it) all but inevitable. The EU regards the "four freedoms" (goods, capital, services and people) as indivisible and will not grant the UK an exemption. The risk of empowering eurosceptics elsewhere is too great. Only at the cost of leaving the single market will the UK regain control of immigration.

May sought to open up a dividing line by declaring that "the Labour Party wants to continue with free movement" (it has refused to rule out its continuation). "I want to deliver on the will of the British people, he is trying to frustrate the British people," she said. The problem is determining what the people's will is. Though polls show voters want control of free movement, they also show they want to maintain single market membership. It is not only Boris Johnson who is pro-having cake and pro-eating it. 

Corbyn later revealed that he had been "consulting the great philosophers" as to the meaning of Brexit (a possible explanation for the non-mention of Heathrow, Zac Goldsmith's resignation and May's Goldman Sachs speech). "All I can come up with is Baldrick, who says our cunning plan is to have no plan," he quipped. Without missing a beat, May replied: "I'm interested that [he] chose Baldrick, of course the actor playing Baldrick was a member of the Labour Party, as I recall." (Tony Robinson, a Corbyn critic ("crap leader"), later tweeted that he still is one). "We're going to deliver the best possible deal in goods and services and we're going to deliver an end to free movement," May continued. The problem for her is that the latter aim means that the "best possible deal" may be a long way from the best. 

George Eaton is political editor of the New Statesman.