A JOINT offer from US private equity firm Carlyle Group and consultancy firm WS Atkins has emerged as a leading bid in the u600m (E930m) auction of QinetiQ, the British government defence research business.The bid is one of about five selected for the next round and is significantly higher than initially expected. The government is selling off 49% of QinetiQ and bankers had initially valued it at about u500m (E775m).QinetiQ has successfully applied defence technology to civilian uses. The highest-profile example is the use of its missile-tracking software as a tool for Sky Televis