Jon Hewson, chief executive of CN Radio has left the group after three years, saying that he was unable to take the company any further.
Hewson said: “I’ve decided to move on but wanted to free myself up to look at other options in an open and honest way rather than while I was there.
“I have quite a few options – there are a couple of people I’m talking to and a couple of things I’m thinking about – but it was time to move on from CN.”