Energis' UK operation makes sales of £750m and an underlying profit of around £170m a year and has attracted interest from venture capitalists such as Apax Partners and Kohlberg Kravis Roberts. But its UK strength could tempt bankers to press for a sale, which would easily cover the banks' debt, but might pose problems for bondholders. Separately, rival Colt Telecom is looking at Energis' Dutch operation.