Ruth Jones is best known for playing Nessa in Gavin and Stacey - the BBC TV comedy she co-wrote with James Corden - and also for starring in and writing the comedy series Stella, set in her native South Wales. Earlier this year she also wrote her first novel, Never Greener, which tells the story of a rekindled affair. It sparked a 10-way publishers bidding war and was immediately propelled to the top of the bestseller charts upon its release. Ruth lives in South Wales with her husband David, but she travelled to the Telegraph offices in London to talk to Laura Powell about love, marriage and what it was really like writing Gavin and Stacey with James Corden.