With problems in Parliament trying to get consensus on a withdrawal agreement, it seemed the main political parties were edging away from the centre ground. Did this leave a vacuum for a new movement? In 2019, more or less simultaneously, a new party started and a new campaign launched, both supporting a so-called People's Vote on any Brexit deal. The Independent Group - or Change UK, as they came to be known - was not without challenges. Neither was the People's Vote campaign. Eventually, the friction came to be personal. Mark Mardell speaks to the people involved about where it all went wrong. Email: worldatone@bbc.co.uk. Twitter: #BBCWATO