Huawei $2 billion security pledge followed walkout by British official - sources

LONDON (Reuters) - Huawei's relations with British authorities hit a low last month when a top official walked out of a meeting with the Chinese company over its perceived failure to fix security holes in its products, sources familiar with the talks told Reuters.Although Huawei responded with a pledge to spend $2 billion (1.58 billion pounds) on a security overhaul to address the British concerns, tensions between London and the world's biggest producer of telecoms equipment remain high as it..