LONDON : British Prime Minister Boris Johnson was on Monday pondering a second national lockdown as an accelerating coronavirus outbreak threatened to destroy any shoots of economic recovery and send millions back into isolation.The United Kingdom already has the biggest official COVID-19 death toll in Europe - and the fifth largest in the world - while it is borrowing record amounts in an attempt to pump emergency money through the damaged economy.But new COVID-19 cases are rising by at least 6,000 per day in Britain, according to week-old data, hospital admissions are doubling every eight days, and the testing system is buckling."The trend in the UK is heading in the wrong direction and we are at a critical point in the pandemic," Chris.