(Reuters) - UK telecoms regulator Ofcom has launched a probe into whether BT Group is abusing its dominant position when pricing its superfast broadband, following a complaint by smaller rival TalkTalk Telecom Group. Ofcom said it was in the early stages of an investigation into BT. BT, the biggest fixed-line operator in the country, allows rival operators to take its superfast fiber product on a wholesale basis at the same fee at which it sells it to its own retail arm, BT Retail. ...