“I think we’ve certainly reached a point where the stories could potentially peter out if we carried on,” she told ITV Press Centre. “I think we’ve pretty much been everywhere with the client/escort stories, and as that’s the heart of every episode, you wouldn’t want to exhaust it to the point of just complete ridiculousness and seediness.”

Secret Diary Of A Call Girl begins its 8-part fourth series at 10pm on Tuesday 1st February 2011 on ITV2.