50 of the best lunchtime sandwiches (UK)

From The Telegraph, UK: "Ever since it was invented in 1762, the sandwich has been greasing the wheels of the British economy. Even in these lean times, a filling spread between two slices of bread has come into its own. Last year, hungry office workers consumed more than 2.8billion pre-packed sandwiches. Our appetite for new flavoured fillings even prompted Marks and Spencer to announce earlier this month a retro addition to its range of 35 varieties: the jam sandwich (strawberry on white, cut on the diagonal), for a recession-busting 79p. While lunching al desko is beneficial for the economy – sandwich chains on the whole are faring well, even if nothing else on the high street is – how healthy are the sandwiches that we're eating? 'Traffic light' labelling, which shows levels of salt, sugar, fat and calories, offers some nutritional guidance to the hungry worker. But few of us have the time, let alone the inclination, to read the food label when we need to get back to the office. So we asked a handful of nutritionists to assess 50 of the most popular pre-packed sandwiches on sale in sandwich chains and supermarkets. Needless to say, M&S's jam sandwich failed to earn five stars for nutritional value – but is your lunchtime favourite doing you good?