By David Milliken LONDON (Reuters) -British Prime Minister Rishi Sunak said on Monday that the so-called “golden era” of relations with China was over, saying Beijing’s systemic challenge to Britain’s interests and values was growing more acute. In his first major foreign policy speech, Sunak said Britain’s approach to China needed to evolve and Beijing was “consciously competing for global influence using all the levers of state power”. “Let’s be clear, the so-called ‘golden era’ is over, along with the naive idea that trade would lead to social and political reform,” Sunak said in London’s f…