Severn Trent has appointed Liv Garfield, the boss of BT’s Openreach, as its next chief executive. The live wire boss has been praised for her management of BT’s £2.5bn high speed broadband roll-out and has been widely tipped for another big job: she was recently named in the top 10 of Fortune’s list of global young hot shots. She will replace Tony Wray in spring 2014.