LONDON (Reuters) - More British workers will call in "sick" Monday than on any other day in 2006, many opting to make their excuses by text message or by phoning in with an artistic cough or splutter, research revealed Monday. Widespread dissatisfaction with holiday allowances combined with a post-Christmas comedown will contribute to thousands of Britons, who work some of the longest hours in Europe, staying at home to recharge their batteries. "Early February is a very popular time for taking a 'sickie', the first bank holiday still seems a long way off, the days are gloomy and many people...