UK Stocks-Factors to watch on August 23

Aug 23 (Reuters) - Britain's FTSE 100 index is seen opening up 24 to 28 points, or 0.4 percent, on Tuesday, according to financial bookmakers. * The UK blue chip index closed down 0.4 percent, or 6,828.54 points, on Monday, with commodity-related stocks leading the market lower following a drop in metals and crude oil prices. * RANK GROUP: Casino operator Rank Group Plc said on Tuesday Britain's decision to leave the European Union would have little or no direct impact on its perfo