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A billionaire tycoon named in the HSBC tax scandal files had dinner with David Cameron and senior Tories after giving the party £50,000.

Car firm heir Georg von Opel was among dozens of mega-rich donors who attended exclusive “Dinner with Dave” events between October and December 2014.

He was named last week in leaked files revealing account holders at HSBC’s scandal-hit private bank in Switzerland.

Other donors at the Tories’ latest “leader’s club” events included the wife of the UK boss of Goldman Sachs, and a businessman accused of fraud.

The list was quietly slipped out on the Conservative Party website this week.

The Tories deny the controversial dinners amount to “cash for access” to the Prime Minister.

But Labour MP Karl Turner stormed: “It is an outrage that the Tory Party bankrolls its election campaign by offering these cosy dinner dates.

“David Cameron is totally dependent on cash from a small number of super-wealthy. No wonder the Tories only look after the rich.”

Mr von Opel, the great-grandson of German car maker Adam Opel, inherited £100million when he was just 22.

He owns properties and a business in the UK, and his wife Emily is British. He has been on the electoral register here since 2010.

But his office states he is a long-standing Swiss national and resident, and therefore it is legitimate for him to hold bank accounts in Switzerland.

In a statement last week it said none of his bank accounts have ever been used for tax avoidance.

The revelation Mr von Opel dined with the Prime Minister in recent months underlines the close links between the Tories and many of the rich individuals named in the HSBC files.

Labour are furious that just one person has been prosecuted from the 1,100 cases of HSBC tax avoidance handed to tax officials in 2010.

Shadow chancellor Ed Balls today wrote to George Osborne asking what he knew.

Mr Osborne was one of several high-ranking Tories who attended the latest round of ‘leader’s club’ dinners, specially arranged for donors who cough up £50,000 a year.

(Image: PA)

In total, 44 City fatcats and wealthy business figures attended the exclusive events in the final months of 2014.

Several other donors, not on the HSBC list, included Dr Michael Lynch, a British businessman who has been accused by computer giant Hewlett Packard of “massive fraud” for allegedly hugely overvaluing a firm he sold them in a deal which netted him hundreds of millions.

Mr Lynch vehemently denies wrongdoing and has HP of making “false representations”.

Other Dave diners include Melanie Sherwood, the wife of Goldman Sachs’ top UK executive Mike Sherwood.

Mr Sherwood previously claimed to be “politically unaligned”, although he and his wife paid thousands for a Tory party event in 2008.

Mr Sherwood already knows Samantha Cameron well, after heading up the consortium which bought luxury goods firm Smythson where she worked as creative director.

He later sold the company for a multi-million pound profit. His long career at Goldman has netted him an estimated £200million fortune.

Others who shelled out to rub shoulders with the PM over dinner include:

Michael Spencer, a former Tory party treasurer whose City firm ICAP was fined £54million in the LIBOR scandal

Sir Henry Keswick, Eton-educated chairman of sprawling business group Jardine Matheson

Dr James Hay, a billionaire racehorse owner and close pal of the Middleton family

Stockbroker Howard Shore, whose wife organised the latest Tory summer ball

(Image: PA)

Alexander Temerko, an energy tycoon wanted on fraud charges in Russia. He has been granted residency in the UK after a judge ruled the charges were politically motivated.

Insurance executive Andrew Brannon, who has donated almost £500,000 to the party and is a member of the alleged tax avoidance scheme Close Film Sale, and Rosemary Said, wife of Syrian-born billionaire Wafic Said, who arranged Saudi arms deals, also graced the Tory tables.

But the most exclusive treatment was saved for Sir Michael Hintze, who last May gave the Tories £1.5million, their biggest single donation in six years.

Sir Michael and his wife Dorothy were treated to an exclusive dinner at the PM’s official country pad Chequers.

There is no suggestion any of the donors have done anything wrong.

A Conservative spokesman said: “All donations are properly and transparently declared to the Electoral Commission, published by them, and comply fully with Electoral Commission rules.”

A panicking Tory MP backtracked today after agreeing to hand back a £5,000 donation.

Charlotte Leslie received the cash from millionaire Hugh Sloane in December.

His investment firm Sloane Robinson was ordered to cough up £13million in unpaid tax following an HMRC probe in 2012.

Ms Leslie said on Monday she would hand back the cash. But hours later she said she had misunderstood the situation and would, in fact, keep the money.

Two other Tory MPs have received donations from Mr Sloane.

Ms Leslie said: “I indicated that if I had received a donation from someone who had been found guilty of tax evasion, I would return it.

“On further examination, it is clear this was not tax evasion.”

Labour questioned if Tory spin doctors had forced her U-turn.