UK Stocks-Factors to watch on Dec 15

Dec 15 (Reuters) - Britain's FTSE 100 index is seen opening down 13 points on Friday, according to financial bookmakers. * OLD MUTUAL: The chief of Old Mutual Global Investors (OMGI) Richard Buxton is nearing a 550 million pound buyout of the company, according to a person familiar with the matter. * BP: BP plans to invest $200 million in Europe's largest solar power developer Lightsource, with a 43 percent stake buy, the Financial Times reported on Friday. http://on.ft.com/2Bq