UK Stocks-Factors to watch on June 30

June 30 (Reuters) - Britain's FTSE 100 index is seen opening up 8 points, or 0.1 percent, on Thursday, according to financial bookmakers. * The UK blue chip index closed up 3.6 percent on Wednesday at 6,360.06, highest level since April, as a two-day rally recouped the losses it suffered after Britain voted to leave the European Union. * RIO TINTO: Rio Tinto Ltd will sever mining links with resource-rich Papua New Guinea, relinquishing ownership of the Panguna copper mine on Bouga