text: Property portfolio: Sol Campbell and his wife Fiona . The polls might have the parties neck-and-neck – but it looks like Sol Campbell is taking no chances. For the second time this year, the former England footballer is selling a multi-million pound property – leading to speculation he wants to dodge Labour’s mansion tax if the party wins the election. An outspoken critic of the policy, Campbell has even threatened to leave the country if the tax on properties over £2million comes into force. Earlier this year it was revealed he had taken the apparently bizarre decision to sell a £20million London townhouse to a company owned by himself. Land Registry documents suggest the sale was registered the day after higher stamp duty levies came into effect. But it is possible the sale took place shortly before, meaning the increased charges would have been avoided. Now Campbell has listed a second property for sale in the same exclusive neighbourhood of Chelsea. A former home of James Bond author Ian Fleming, the luxury penthouse by the Thames is on the market for £6.75million. Campbell bought it in 2011 for £4.25million after he reportedly staged a sit-in at an estate agents’ in the hope of securing it for his family – his wife Fiona Barratt-Campbell and their children Isabella and Ethan. It has since been extensively renovated by his wife, an interior designer and granddaughter of Barratt Homes founder Sir Lawrie Barratt. An advert for the property states: ‘There are few properties within Chelsea that can offer the combination of views, spacious accommodation and exquisite finish.’ Yet Campbell, 40, seems to be keen to rid himself of the flat before the election. Eye for detail: The living room inside Campbell's £6.75million Chelsea flat boasts lavish furnishings . Nice touch: The former Arsenal and Tottenham Hotspur defender's kitchen is filled with marble . Sumptuous: Gilded mirrors line the hall in Campbell's luxurious flat, which is in an exclusive neighbourhood . Last year the former Arsenal and Tottenham defender blasted the proposed mansion tax, describing it as a ‘cheap and easy way to extract money from individuals who have done well’. He told The Times: ‘With a mansion tax, you’re taxing me for being prudent ... If Labour gets in, I’d leave. I’d have to say, “Sorry, I want to ship out”.’ Campbell has also said: ‘I’m not earning what I was earning five years ago.’ Experts have said that properties worth between £5million and £10million could incur an annual charge of up to £25,000 under a Labour government. Henry Pryor, a buying agent and property commentator, said: ‘Sellers like Sol Campbell face a financial dilemma: to take a certain hit now or await the potential tax bill that a Labour or Lib Dem Government may generate.’ Since 2009 Campbell has also owned Grade II-listed Hallington Hall, an 18th Century mansion in Northumberland. Fortune: Campbell accumulated a number of properties before and after his football career but has since said 'I don't earn what I used to' Campbell recently featured in a hard-hitting campaign to encourage ethnic minority Britons to vote .
target: Sol Campbell has put his flat in Chelsea on the market for £6.75million .
  He bought the property in 2011 and it has been renovated by his wife Fiona .
  Former England footballer is an outspoken critic of Labour's mansion tax .
  Campbell, 40, sold his £20million London townhouse earlier this year .