Left and centrist parties in France are banding together to keep the far right candidate Marine Le Penn's party from power. Le Pen's National Rally (RN) and its allies on the right finished first with 33% of the vote in the first roubnd of voting, President Emmanuel Macron's centrist bloc came third. This week second-round of voting takes place this weekend. Paris-based journalist Peter Allen spoke to Ingrid Hipkiss.