Banker Lena Tan and stay-at-home husband in £11m divorce battle Lena Tan amassed £11million fortune as hedge fund manager and bought £4.5million Kensington mansion with husband Weng Choy After the couple had an argument in Singapore he filed for divorce They have shared out proceeds from the sale of £1million wine collection Ms Tan argues divorce case should not be heard in Britain because she lives in Malaysia and Mr Choy is from Hong Kong A City high-flier is locked in an £11million divorce battle with her stay-at-home husband after a blazing argument during a family holiday proved the 'final straw' for their 15-year marriage. Weng Choy and his wife Lena Tan amassed a huge fortune thanks to her career as an investment banker, including a wine collection worth £1million and a £4.5million flat in Kensington which they bought without a mortgage. After the couple split, Mr Choy demanded a large share of their wealth, claiming that he sacrificed his own banking career for the sake of his wife's job. Battle: Lena Tan, left, and Wang Choy, right, are fighting over their £11million fortune after filing for divorce The Court of Appeal in London heard today that the jet-setting couple had homes in Hong Kong and Malaysia as well as the UK, while their two sons boarded at English public schools. But they broke up in January 2012 when Mr Choy, 56, filed for divorce in the English courts in the wake of a huge row the couple had on New Year's Eve while on holiday in Singapore. He wants the case to be handled in England, which is traditionally generous to the partners of wealthy spouses - but Ms Tan, 54, a hedge fund manager, has initiated rival divorce proceedings in Malaysia. Last year a High Court judge ruled that Mr Choy had been 'habitually resident' in London for at least a year before he filed for divorce, and so was entitled to use the English courts in the case. But James Turner QC, acting for Ms Tan, today argued that the divorce should not have been allowed to proceed, even though more than half the couple's wealth is invested in Britain, on the grounds that Mr Choy's true 'home' is in Hong Kong. He told the court that the marriage hit a 'crisis' following a falling-out in September 2010, but they were reconciled until the relationship 'struck the rock of the row on New Year's Eve 2011'. Home: The couple used Ms Tan's earnings as a hedge fund manager to buy a £4.5million flat in this building in Kensington without getting a mortgage The court heard the couple fought on a family holiday in Singapore (pictured) during Christmas 2011/2012 The lawyer continued: 'Married family life between the parties continued to some degree at least, and had Hong Kong as its centre, until a row took place between the parties during a family holiday in Singapore during the Christmas 2011/New Year 2012 period, following which the husband came to England. Clearly, each member of the family in the present case had been habitually resident in Hong Kong where the family home and centre of interests had been located for a considerable period. Mr Turner urged the court to take into account the 'personal convenience' of Ms Tan as the 'family breadwinner, bearing in mind the need for her physical presence in Malaysia', adding that Mr Choy is more able to travel to court hearings because he 'is not gainfully employed'. He also argued it was unfair that after the couple had split the proceeds of selling their wine collection, Ms Tan was ordered to pay her ex-husband an additional £100,000 to pay his legal bills. Tim Bishop QC, for Mr Choy, insisted that the husband had been forming closer ties to London for two decades, and had used the city as his base since the Holland Park row in 2010. 'When the centre of the husband's interest ceased to be Hong Kong as his connection with Hong Kong broke down upon the end of his marriage, London was the natural and obvious replacement,' he said. Hearing: The Court of Appeal, sitting in the Royal Courts of Justice, is set to rule on the pair's divorce 'The judge found that they had an international marriage which, from 1998, involved them moving around the world following the wife's work. They owned property, they had homes in a number of countries - England, Singapore and Malaysia - but the jewel in the crown of their assets was the South Kensington apartment, worth £4-4.75million, never mortgaged, never let out. 'After the marriage broke down, the husband's centre of interests ceased to be dictated by the wife's working life. 'London was capable of swiftly becoming the husband's permanent centre of interests after the breakdown of the marriage.' Mr Turner said that since the separation, Mr Choy obtained a British driving licence and a National Insurance number, symbolising his commitment to the country. 'Having separated from his wife, his connection to Hong Kong fell away and his home - the place he lived, his centre of interest, his habitual residence - became London,' the barrister concluded. Lord Justice Leveson, Lord Justice Aikens and Lady Justice Macur reserved judgement and will give their ruling at a later date.