Traffic congestion was down by up to 50 percent compared to recent Mondays as the rush hour thinned out, while almost 20 per cent fewer people used the London underground, travel tech firm TomTom found. One loner tweeted: "I'm in a flat slap bang in the middle of London and the roads are unbelievably quiet now." Businesses meanwhile issued a warning about the damaging impact of the new work-from-home diktat.