UPDATE 1-UK Stocks-Factors to watch on Jan 19

(Adds company news items, futures) Jan 19 (Reuters) - Britain's FTSE 100 futures were up 0.15 percent ahead of the cash market open on Friday. * ESURE: British insurer esure Group Plc said on Friday Stuart Vann, its chief executive since 2012, would step down immediately by mutual consent and its finance head Darren Ogden would take over as interim CEO. * CARPETRIGHT: Britain's biggest floor coverings retailer Carpetright warned on full-ye