UK Stocks-Factors to watch on July 27

July 27 (Reuters) - Britain's FTSE 100 index is seen opening down 1 point at 7451.8 on Thursday, according to financial bookmakers. * SHELL: Royal Dutch Shell Plc is planning to make repairs to the heavy oil hydrocracking unit (HCU) at its 227,586 barrel-per-day (bpd) Convent, Louisiana, refinery during an overhaul in the spring of 2018, said sources familiar with plant operations. * LLOYDS: Lloyds Banking Group is to repay nearly 300 million pounds to customers over mortgage ar