UK Stocks-Factors to watch on Jan. 8

Britain's FTSE 100 index is seen opening 28 points lower at 7,546 on Wednesday, according to financial bookmakers. * NMC HEALTH: Two investors of NMC Health Plc are selling shares worth 374 million pounds ($490 million) in the healthcare group, a bookrunner for the deal said on Tuesday, weeks after short-selling firm Muddy Waters questioned the company's finances. * BARCLAYS: A group of Barclays shareholders coordinated by responsible investment lobby group ShareAct