By Chris Dorrell HSBC announced yet another share buyback scheme and upped its guidance for the remainder of the year after beating expectations in the second quarter. Pre-tax profit increase to $8.9bn in the three months to June, comfortably higher than the $7.8bn expected by analysts and slightly ahead of last year. The increase in profit was largely due to lower expected credit loss, which decreased by $600m. There were lower charges for commercial real estate in China and a reduction for HSBC’s UK division too. This offset slightly lower revenue and higher operating costs resulting from th…