UK Stocks-Factors to watch on March 7

March 7 (Reuters) - Britain's FTSE 100 index is seen opening up 11 points on Tuesday, according to financial bookmakers. * TESCO/BOOKER: The hefty savings that can be made by reducing food waste are one of the factors behind Tesco's 3.7 billion pound ($4.5 billion) takeover offer for wholesaler Booker, the British supermarket chain's chief executive says. * BRITAIN RETAIL: British consumers are cutting back on non-essential spending as the impact of last year's Brexit vote pushe