Students Hayley and James are young and in love. After saying goodbye for Christmas at a London train station, they both make the same mad split-second decision to swap trains and surprise each other. Passing each other in the station, they are completely unaware that they have just swapped Christmases.

They've swapped Christmas – again. Can Hayley and James' relationship survive another turbulent family Christmas or has their future together gone off-piste?!