Bupa has reported positive results for the six months ended 30 June 2011.Healthcare Market News (COMPANY NEWS) August 2011The healthcare giant saw revenues rise 6% to £3.93bn (2010: £3.71bn), underlying surplus (before tax) rocket to £247.2m (2010: £183.6m) and customer numbers increase to 10.7 million (FY2010: 10.6 million). Gross insurance premiums rose slightly from £2.9bn…