Piers Morgan has hit back at a Coronation Street star, calling him an "impertinent little twerp" for dissing him on the soap. On Monday night, Corrie viewers chuckled as Seb Franklin (played by Harry Visinoni) mocked ex-Good Morning Britain host Piers, claiming he "did his nut in".The scene began with Roy Cropper (David Neilson) trying to talk to Seb about how fast his relationship with Nina Lucas (Mollie Gallagher) was moving.