Who do you call when things go wrong in the night? When night falls most of us are tucked up in our beds, but the working day isn't over for everyone. A growing army of dedicated professionals are waiting to answer our call and come to the rescue in our moment of need. These are not the emergency services workers with flashing blue lights, but the unsung heroes of the night: plumbers, GPs, car breakdown mechanics, vets... Britain on Call goes on the road with Manchester's night workers and witnesses the shocking, hilarious and revealing moments they have to deal with every night.