UPDATE 1-UK Stocks-Factors to watch on March 6

(Adds company news item, futures) March 6 (Reuters) - Britain's FTSE 100 futures were flat ahead of the cash market open on Monday. * STANDARD LIFE-ABERDEEN ASSET: Standard Life and Aberdeen Asset Management, two of Scotland's most well-known financial firms, agreed to merge in an all-share transaction to create Britain's largest investment manager. * BT GROUP: Britain's BT has won the rights to broadcast the UEFA Champions League and Europa League for another three years in a