UPDATE 1-UK Stocks-Factors to watch on Dec 20 By: Reuters: Company News December 20, 2018 at 02:50 AM EST Dec 20 - Britain's FTSE 100 index is seen opening 92 points lower at 6,674 with futures down 1.72 percent ahead of the cash market open on Thursday. Read More >> Related Stocks: Astrazeneca Plc ADR Gsk Plc ADR Merck & Co S&P Insurance ETF SPDR US Short Oil