UPDATE 2-UK Stocks-Factors to watch on March 14

(Adds company news item) March 14 (Reuters) - Britain's FTSE 100 index is seen opening up 4.7 points on Tuesday, according to financial bookmakers, with futures up 0.2 percent ahead of the cash market open. * SIG: British building materials suppler SIG cut its dividend by 20 percent and named a new chief executive on Tuesday as it battles to recover from a November profit warning. * OCADO: Ocado , the British online supermarket that h