Head of a Young Woman, owned by banker Jaime Botin, had previously been refused for export by Spanish authorities on grounds of cultural importance A Picasso worth €25m (£17.5m/US$27.4 million) and considered a cultural treasure by Spanish authorities who had barred it from being exported has been seized from a boat docked at Corsica, according to French authorities.An attempt to export the painting, Head of a Young Woman, to Switzerland on Thursday “drew the attention of French officials”, the country’s customs authority said in a statement, with customs agents on the French island boarding the vessel the following day.