Waitrose has announced it will introduce the UK's first chicken that is a source of omega 3 - a groundbreaking move for a British supermarket. Omega 3s are polyunsaturated fatty acids which, as a key part of a balanced diet, help to maintain normal heart, brain and vision function. Research undertaken in 2013 showed people with the highest levels of omega 3 had a 40 per cent reduction in cardiovascular related deaths compared to people with the lowest levels. Optimum health benefits are obtained…