The West Lancashire by-election was triggered by the retirement of Labour's Rosie Cooper. After 17 years in the seat she has stood down to focus on her new role as chair of Mersey Care NHS Foundation Trust.Students from the Edge Hill Politics L
We're down to the final two. Paula Keaveney, Senior Lecturer in Politics at Edge Hill University, takes a look at Liz Truss and Rishi Sunak, and the path they will have to follow to No 10.