Spanish full-back on moving on from the Emirates Stadium, his elation at his old club ending their title drought, and how Mikel Arteta has helped prolong his career One day when he was 18 or 19, still near the start of his journey, Héctor Bellerín got a call from Mikel Arteta inviting him round. He remembers asking lunch or dinner but this was neither. “When I arrived that afternoon, he was sitting with a financial adviser and they started to ask: ‘How much do you spend on this?’ ‘How much do y…