Everyone has a Tully Dawson (Tony Curran) - the friend who defines your life. In the summer of 1986, in a small Scottish town, Jimmy (Martin Compston) and Tully ignite a brilliant friendship based on music, films and the rebel spirit. With school over and the locked world of their fathers before them, they rush towards the climax of their youth - a magical weekend in Manchester, the epicentre of everything that inspires them in working-class Britain. There, against the greatest soundtrack ever recorded, a vow is made: to go at life differently. Thirty years on, half a life away, the phone rings. Tully has the worst kind of news, and a request that will test their friendship, love, and loyalty to the limit… Mayflies is a memorial to youth’s euphoria and to everyday tragedy. A tender goodbye to an old union, it discovers the joy and the costs of love.