Ed Davey suggested British Gas had charged one of the highest prices to domestic customers in the last three years. Photograph: Getty Images.
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Six questions answered on Centrica's share price fall after suggestions British Gas could be broken-up

Why is Ed Davey investigating British Gas’s profit margins?

British Gas owner, Centrica, suffered a fall in share price today after the UK energy secretary investigated its profit margins and suggested the company may have to be broken up. We answer five questions on the potential break-up of British Gas.

By how much has Centrica’s share price fallen?

The share price fell by 3 per cent today after energy minister Ed Davey questioned the company’s dominance in the market. British Gas currently has 41 per cent of the domestic gas supply market in the UK, the largest share of any of the so-called "big six".

Why is Ed Davey investigating British Gas’s profit margins?

Davey said in a letter that profit margins made by the "big six" energy suppliers when supplying gas were actually higher than previously thought. In particular, he highlighted the high profit margin of British Gas and its large market share. He added that British Gas had charged one of the highest prices to domestic customers in the last three years.

He estimated that if gas margins were similar to electricity households would save on average up to £40 a year. Davey also provided information that showed Centrica saw profit margins of 11.2 per cent for its gas business in 2012. He suggested a market investigation.

Why has Davey said British Gas may have to be broken-up?

If an investigation found evidence of a monopoly this could result in the company being broken-up. As well as asking the competition authorities to investigate the profit margins as part of an ongoing review, he has written to energy regulator Ofgem and the Competition and Markets Authority asking them to consider all possible avenues "including a break-up of any companies found to have monopoly power to the detriment of the consumer".

What else has Davey said?

Mr Davey told the BBC: "This is a significant issue for consumers out there who are struggling with their energy bills."

In his letter he says: "Analysis of the profit margins of the energy companies shows that the average profit margin for gas is around three times that of electricity.

"There is also evidence that British Gas, the company with the largest share of the gas domestic supply market, has tended to charge one of the highest prices over the past three years, and has been on average the most profitable."

What has British Gas said about Davey’s comments?

In its statement, British Gas said: "We welcome this and have complied with all the requests for data which we have received.

"The data referred to in the Secretary of State's letter has already been fully disclosed and in the public domain for a number of weeks."

What have the independent experts said?

Some have queried why this publicly available information hasn’t been investigated by Ofgem already.

However, Richard Lloyd, the executive director of the consumer rights group Which?, told the BBC the intervention was hugely significant and suggested Davey agreed with Which? that the structure of the biggest energy companies is partly to blame for the price hikes.

"It will now put huge pressure on the regulators, in a matter of weeks, to announce that they're taking the first steps towards potentially breaking up the very biggest of the big energy companies," he added.

Heidi Vella is a features writer for Nridigital.com

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Commons confidential: Vive May's revolution

It's a risky time to be an old Etonian in the Tory party. . . 

The blond insulter-in-chief, Boris Johnson, survives as Theresa May’s pet Old Etonian but the purge of the Notting Hell set has left Tory sons of privilege suddenly hiding their poshness. The trustafundian Zac Goldsmith was expelled from Eton at the age of 16 after marijuana was found in his room, unlike David Cameron, who survived a cannabis bust at the school. The disgrace left Richmond MP Goldsmith shunned by his alma mater. My snout whispered that he is telling colleagues that Eton is now asking if he would like to be listed as a distinguished old boy. With the Tory party under new, middle-class management, he informed MPs that it was wise to decline.

Smart operator, David Davis. The broken-nosed Action Man is a keen student of geopolitics. While the unlikely Foreign Secretary Johnson is on his world apology tour, the Brexit Secretary has based himself in 9 Downing Street, where the whips used to congregate until Tony Blair annexed the space. The proximity to power gives Davis the ear of May, and the SAS reservist stresses menacingly to visitors that he won’t accept Johnson’s Foreign Office tanks on his Brexit lawn. King Charles Street never felt so far from Downing Street.

No prisoners are taken by either side in Labour’s civil war. The Tories are equally vicious, if sneakier, preferring to attack each other in private rather than in public. No reshuffle appointment caused greater upset than that of the Humberside grumbler Andrew Percy as Northern Powerhouse minister. He was a teacher, and the seething overlooked disdainfully refer to his role as the Northern Schoolhouse job.

Philip Hammond has the air of an undertaker and an unenviable reputation as the dullest of Tory speakers. During a life-sapping address for a fundraiser at Rutland Golf Club, the rebellious Leicestershire lip Andrew Bridgen was overheard saying in sotto voce: “His speech is drier than the bloody chicken.” The mad axeman Hammond’s economics are also frighteningly dry.

The Corbynista revolution has reached communist China, where an informant reports that the Hong Kong branch of the Labour Party is now in the hands of Britain’s red leader. Of all the groups backing Jezza, Bankers 4 Corbyn is surely the most incongruous.

Labour’s newest MP, Rosena Allin-Khan of Tooting, arrived in a Westminster at its back-stabbing height. Leaving a particularly poisonous gathering of the parliamentary party, the concerned deputy leader, Tom Watson, inquired paternalistically if she was OK. “I’m loving it,” the doctor shot back with a smile. Years of rowdy Friday nights in A&E are obviously good training for politics.

Kevin Maguire is the associate editor (politics) of the Daily Mirror

Kevin Maguire is Associate Editor (Politics) on the Daily Mirror and author of our Commons Confidential column on the high politics and low life in Westminster. An award-winning journalist, he is in frequent demand on television and radio and co-authored a book on great parliamentary scandals. He was formerly Chief Reporter on the Guardian and Labour Correspondent on the Daily Telegraph.

This article first appeared in the 28 July 2016 issue of the New Statesman, Summer Double Issue