British Prime Minister David Cameron flew into China saying he wanted to lay the ground for a multi-billion-dollar free trade deal between Beijing and the European Union, despite growing unease about his own country's membership of the bloc. On a three-day visit with a delegation of around 100 business people, the largest British mission of its kind ever, Cameron said he wanted his country to play an important role in China's expansion as the world's second biggest economy is talking about opening up its markets. "China's transformation is one of the defining facts of our lifetime," Cameron wrote in Caixin, a Chinese weekly news magazine, on the eve of the visit. "There is a genuine choice for every country over how to respond. They can choose to see China's rise as a threat or an opportunity. Britain's answer is clear. We want to see China succeed." Cameron's push for an EU-China trade deal will irritate the European Commission, which is understood to be strongly opposed to such a move on the grounds that it risks flooding the bloc with cheap Chinese imports.