He said that the broadcaster needs "another beast" to go alongside Big Brother, which he admitted will eventually start to "tail off", although he believes the reality show still has a "good few years in it yet".
"I don't want to be reliant on it [but] it is the great white hope I guess," he said. "One day it will start to fail and tail off. I like to think it has a lot more in it. We will continue to surprise people, evolve it. It has a good few years in it yet."
