British politics is chock-full of stories of people overcoming adversity in an effort to make things better for others. But few will compare to the journey taken by Rosena Allin-Khan, Labour MP for Tooting and newly-declared hopeful for deputy leader. From grade-A student to school drop-out, she crowdfunded her way into Cambridge to study medicine and worked as a junior doctor on the A&E frontline before being elected an MP.