Tesco CEO Philip Clarke has opted not to take an annual bonus of about £372,000 following a poor performance in its main British market. The retail colossus is now investing about £1 billion in an attempt to stem a dropping UK market share. Clarke, a former Tesco shelf stacker, emailed a statement to the Reuters news agency: "I decided at the beginning of the year that I would decline my annual bonus for 2012. I wasn't satisfied with the performance in the UK."