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David Cameron is facing calls to crackdown on the Whitehall gravy train as former ministers earn hundreds of pounds an hour in relevant industries.

At least 25 former top government ministers are now raking in well over £1million between them.

Many are making thousands of pounds a day in plum part-time roles as directors, advisers or board chairmen.

They have broken no rules and there is no suggestion of wrongdoing.

But it highlights how a trumpeted Tory move to stop ministers cashing in after leaving office has barely slowed the revolving door from Whitehall to big business.

Here are 18 former cabinet ministers who are now working in relevant industries.

Chris Huhne - Lib Dem

(Image: Getty Images)

Old Job: Energy Secretary

New Jobs: Chairman (Europe) of Zilkha Biomass Energy (ZBE); adviser to energy-from-waste body the Anaerobic Digestion and Bioresources Association.

Salaries: Unknown

Direct links to firms: Met with ZBE while in office

(Lord) Andrew Lansley - Conservative

(Image: PA)

Old Job: Health Secretary

New Jobs: Adviser to Swiss drugs firm Roche; private equity giant Blackstone on healthcare investments; and management consultants Bain & Co. on ‘healthcare innovation’.

Salaries: Unknown

Direct link to firms: Roche was one of the main beneficiaries of the Cancer Drugs Fund he set up in 2010.

David Laws - Lib Dem

(Image: REUTERS/Neil Hall)

Old Job: Schools Minister

New Job: Adviser to Ark Schools academy chain

Salary: Unknown

Direct links to firm: Praised Ark as “absolutely fantastic” while Schools Minister in February 2014; Received £15,536 in private donations from Ark trustee Paul Marshall in 2014/15.

Henry Bellingham MP - Conservative

(Image: PA)

Old Job: Africa Minister

New Jobs: Chairman of mining firm Pathfinder Minerals; and Gulf fishing firm Pontus Marine; and director of global consultants Developing Markets Associates (DMA).

Salaries: £4,000-a-month from Pathfinder for up to seven hours’ work (£570-an-hour); £2,500-a-month from DMA for 3.5 hours’ work (£714-an-hour); £1,955-a-month from Pontus for up to four hours’ work (but unpaid since October 2015).

Direct links to firms: Met with all three while Africa Minister, actively lobbied a foreign government on behalf of Pathfinder Minerals.

(Lord) Greg Barker - Conservative

(Image: Trinity Mirror Southern)

Old job: Energy Minister

New Jobs: Adviser to energy firms Lightsource Renewable Energy; Equinox Energy Capital; Solar City Corp USA and Powerhive Ltd.

Salaries: Unknown

Direct links to firms: Met with Lightsource Renewable Energy while in office.

Richard Benyon MP - Conservative

(Image: PA)

Old Job: Water Minister

New Job: Chairman of the UK Water Partnership, set up to ‘promote the interests of the UK water sector” .

Salary: £1,000-a-day for 15 days a year.

Direct link to firm: Had regular dealings with all major water firms while in office. His appointment was approved by his successors in the Department.

Jeremy Browne - Lib Dem

(Image: PA)

Old Job: Foreign Office/Home Office Minister

New Job: Senior representative in Europe for the City of London Corporation

Salary: £200,000-a-year

Direct link to body: Had dealings with City of Corporation while in office.

Paul Burstow - Lib Dem

(Image: PA)

Old Job: Health and Care Minister

New Job: Adviser for private health PR agency MHP Health Communications

Salary: Unknown

Direct link to firm: No direct link.

Stephen Hammond MP - Conservative

Old Job: Transport Minister

New Job: Adviser to transport firm Inmarsat

Salary: £20,000 for 25 hours’ advisory work (£800-an-hour).

Direct link to firm: Visited their offices while Minister and declared himself “hugely impressed”; later spoke at a swanky dinner which they sponsored.

David Heath - Lib Dem

(Image: Getty Images)

Old Job: Environment Minister

New Job: Chairman of Consumer Council for Water, western region

Salary: £40,000-a-year for part-time role; hours unknown.

Direct link to firm: Appointed to the role by officials at his former Department.

Charles Hendry - Conservative

(Image: Getty Images)

Old Job: Energy Minister

New Jobs: Chairman of offshore wind firm Forewind; adviser to electricity grid firm Atlantic Superconnection; adviser to oil trading and energy giant Vitol.

Salaries: £48,000-a-year from Forewind for one day’s work a month (£4,000-a-day); £18,000-a-year from Atlantic Superconnection for one-and-a-half days’ work a month (£1,000-a-day); £60,000-a-year from Vitol for one-and-a-half days’ work a month (£3,300-a-day).

Direct links to firms: Had official meetings with all three firms while in office.

Nick Herbert MP - Conservative

Old Job: Police Minister

New Job: Board member of criminal justice consultancy CREST Advisory (UK) Ltd

Salary: £10,000-a-year for four hours’ work a month (£200-an-hour).

Mark Hoban MP - Conservative

(Image: PA)

Old Job: Treasury Minister

New Jobs: Senior advisor to financial services firm Markit Ltd; non-executive director of the London Stock Exchange

Salaries: Unknown

Direct link to firms: Spoke at Markit’s conference while Minister; Oversaw financial services policy which affected the London Stock Exchange.

Tim Loughton MP - Conservative

(Image: PA)

Old Job: Children’s Minister

New Job: Adviser to independent National Fostering Agency

Salary: £22,000-a-year for three days’ work a month - so around £600-an-hour.

Direct link to firm: Had official dealings with the agency while in office.

Bob Neill MP Conservative

(Image: PA)

Old Job: Local Government Minister

New Job: Director of Cratus Communications, which offers advice and consultancy to local government.

Salary: £400-an-hour

Owen Paterson MP Conservative

(Image: BBC)

Old Job: Northern Ireland Secretary

New Job: Adviser to Belfast-based private healthcare firm Randox Laboratories

Salary: £50,000-a-year for eight hours’ work a month

Direct link to firm: Dealt with Randox while considering Northern Ireland’s corporation tax arrangements.

Jim Paice - Conservative

Old Job: Farming Minister

New Jobs: Director of farming co-op Camgrain. Was also chairman of dairy giant First Milk Ltd until June 2015.

Salaries: Earns £1,000-a-day from Camgrain, working 10 days a year. Was earning £90,000-a-year with First Milk.

Direct links to firms: Had official dealings with First Milk while Farming Minister and Camgrain as a local MP.

Mark Prisk MP - Conservative

(Image: Flying Colours)

Old Job: Housing Minister

New Job: Adviser to private landlord Essential Living Ltd

Salary: £20,000-a-year for one day’s work a month

Direct link to firm: No direct link, but the firm has received cash from Government’s housing agency.

Hugh Robertson - Conservative

(Image: AFP)

Old Job: Minister for Middle East

New Job: Director of International Relations for Falcon and Associates, a PR firm set up to represent the state of Dubai

Salary: Unknown

Direct link to firm: No direct link, but the Foreign Office backed Dubai’s bid to host the World Expo 2020.

Dan Rogerson - Lib Dem

(Image: Daily Mirror)

Old Job: Water Minister

New Job: Chairman of Wessex Water Partnership

Salary: Up to £20,000-a-year for just five or six days’ work - so an estimated £3,500-a-day.*

Direct links to firm: Attended conferences and exchange correspondence with Wessex Water bosses while Water Minister; was interviewed for the job by former Lib Dem colleague David Heath.

Steve Webb - Lib Dem

(Image: PA)

Old Job: Pensions Minister

New Job: Director of Policy for pensions giant Royal London

Salary: Unknown

Direct link to firm: Held “regular meetings” with Royal London and other pensions firms

David Willetts - Conservative

(Image: PA)

Old Job: Universities and Science Minister

New Jobs: Director of satellite firm SSTL; and science investment company Biotech Growth; and Education Investment Adviser for building firm Silvertown.

Salaries: Unknown

Direct links to firms: Had dealings with SSTL and Biotech while in office.