BEIJING (Reuters) — Chinese President Xi Jinping struck a positive tone in a phone call with Britain's new Prime Minister Andy Burnham on Tuesday, saying that Beijing and London share greater common interests than differences.Xi said there was a need to "overcome differences, seek common ground, and expand mutually beneficial cooperation", while adding that the two countries could work together on technology, education, healthcare and the financial sector.Tuesday's call – the first publicly known conversation between the two leaders since Burnham became Britain's prime minister – was held at the latter's invitation, according to the official Chinese summary released by…