LONDON (Reuters) -BT, Britain’s biggest broadband and mobile operator, faces possible industrial action after the Communication Workers Union (CWU) rejected a consolidated pay rise of 1,500 pounds ($1,961) for its frontline workers. BT has about 58,000 frontline staff. It said the award was focused on its lowest-paid workers, equating to an increase of around 8% for some, while those at the top of its frontline salaries would receive more than 3%. The company said it faced difficult trading conditions as Britain emerged from the pandemic, which had exacerbated a trend of year-on-year revenue d…