In less than a month, voters in Spain will head to the polls for an early general election. The vote could see a far-right party, Vox, enter the national parliament for the first time since Spain returned to democracy in 1975. Formed in 2013, Vox failed to make an impact on Spanish politics until last December, when it gained 12 seats in the Andalusian parliament. So how did it make such a breakthrough, and could it do the same nationwide? Our correspondents report.
A programme prepared by Patrick Lovett and Wassim Cornet.
