As Catalonia votes in an election that could lead to a referendum on independence from Spain, Sid Lowe looks at one of the region's great cultural sporting icons, FC Barcelona , and its role in Catalan identity. Key figures in the club's history, including Johan Cruyff, Joan Laporta and current vice-president Carles Vilarrubí explore Barça's motto 'more than a club' and its role in today's political landscape