Postman Pat and the Secret Superhero

Is it a plane? Is it a bird? No, it's Super Pat! The residents of Greendale take on a new light as Charlie and Bill go looking for superheros. First they see Ajay pushing the mail truck for the Rocket...could he be the superhero? Or maybe it's Dr Gilbertson - she went behind the hospital screen and came out as Bonnie - now that really would be special super powers! But then Pat arrives with a very special delivery...