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A new windfall tax on banks is being threatened by ministers amid concerns that many bankers will receive "irresponsible and unacceptable" bonuses this year.Vince Cable, the Business Secretary, will claim today that bankers present more of a threat to Britain than trade unions. In an outspoken attack that will set him on a collision course with the City and heighten tensions in the Coalition, Mr Cable will also allege that the corporate world is "murky", that the capitalist system is tainted and "kills competition", and that markets are "often irrational or rigged," the Telegraph reports.Vast city bonuses provided an unexpected windfall for the Treasury as its one-off tax on bankers' bonuses garnered £1bn more than expected. The "payroll tax", levied on companies for each bonus of more than £25,000 paid to staff between last December and April this year, raised £3.5bn, official data from the Office for National Statistics showed yesterday, the Times reports.Britain is to wind the clock back 30 years to an era of credit controls in an effort to stamp out speculative bubbles and protect consumers from crippling levels of debt under the most extensive overhaul of financial regulation in a generation. Regulators will have the power to cap mortgages, limit credit to real estate investors, and force banks to restrict lending under powers that echo the 1980s - the last time credit could be switched on and off by a central watchdog. Outlining the plans, Financial Services Authority chairman Lord Turner of Ecchinswell called for a "mature public debate" on the issue, acknowledging that the measures, which "may include maximum loan-to-value ratios", would be "unpopular"", the Telegraph reports.Michael Geoghegan, chief executive of HSBC, has threatened to resign from his job if he is not elevated to the chairman's role, according to two people familiar with the bank's succession planning. At a meeting last week Mr Geoghegan reacted badly to the suggestion that he might be passed over, one of the people said. "He was told the board was not ready to give him the chairmanship and he was not happy," the FT reports.Sinochem has underscored its interest in derailing BHP Billiton's bid for PotashCorp of Canada, appointing Deutsche Bank and Citigroup to help it evaluate moves to disrupt the miner's $39bn hostile offer for the company.A Chinese bank, thought to be Industrial and Commercial Bank of China, was also part of the team, people familiar the matter said. However, they warned that the state-owned chemicals group had not yet decided whether to proceed, the FT reports. Trinidad and Tobago has reneged on a deal to buy three offshore patrol vessels from BAE Systems, potentially costing the defence company £150m. The ships were built at BAE's yard in Portsmouth and the first was due to be delivered to the Caribbean nation within weeks. Another has just completed its sea trials with a Trinidadian crew and the final ship is about to begin trials, the Times reports.The company that makes the BlackBerry phone is set to reveal a device intended to challenge Apple's iPad in time for the Christmas rush. Research in Motion, which transformed the lives of executives when it released the BlackBerry almost 15 years ago, has been rumoured for months to be working on a tablet computer ? dubbed the BlackPad ? but has yet to confirm it publicly. However, the Canadian company held a presentation for industry analysts on its home ground last week and will lift the lid on its plans imminently, the Times reports.