Persistent rumours that Mirror Group's Live TV boss, Janet Street-Porter, was about to walk out on the fledgling cable channel were firmly denied by her office. "We've got glass-walled offices here, and you can see her beavering away," a spokesman said. So are she and the Mirror TV head, Kelvin MacKenzie, former Sun editor, seeing eye to eye on everything? "Of course, there are tensions," the spokesman said. "We're spending £30m to launch this station, so both of them loudly say what they think."