UK Stocks-Factors to watch on June 28

June 28 (Reuters) - Britain's FTSE 100 index is seen opening 33 points lower at 7,589 on Thursday, according to financial bookmakers. * CARILLION: Britain's markets watchdog may expand an investigation into the failed outsourcing firm Carillion to examine whether there was illegal trading of shares before the company's collapse. * TAKEDA-SHIRE: A group of Takeda Pharmaceutical Co Ltd shareholders trying to build support to block the $62 billion acquisition of London-listed S