NICK LEESON, the trader blamed for the losses of GBP827 million (HK$10.15 billion) which brought down British merchant bank Barings, is appealing against a German court ruling which yesterday approved his extradition to Singapore. The decision, by the Frankfurt Regional High Court, found the request was valid in 11 out of 12 charges brought against him, including fraud and falsifying documents. Eberhard Kempf, Leeson's German lawyer, said an appeal would be lodged in the Constitutional Court, a process that could stretch into next year. In addition the ruling must also be approved in Bonn. Leeson, 28, has been in a Frankfurt jail since early March after being arrested at the city's airport following a six-day global manhunt. Singapore wants him to face charges of fraud and forgery related to hidden accounts that Leeson established to conceal his losses. The British Government is also considering an extradition request for Leeson, after court summonses were issued against him by a group of Barings investors. But Britain's Serious Fraud Office may yet take over the case and exercise its powers to quash the action. Leeson was not present when his defence lawyer announced the verdict that the court had relayed to him. Last month he admitted concealing secret accounts and huge losses, misleading his bosses and having Barings cash transferred from London under false pretences while he worked in Singapore.