In Britain the end of ‘summer’ isn’t really something to be celebrated, the probability of rain changes from highly likely to definite and the transition is often greeted with complaints of the dark nights closing in on us and the fact that we now have to wear a pair of gloves to bed . But as we Brits are scanning the shops for our new winter coat, the Catalonians are celebrating the end of summer and whole-heartedly greeting a cooler autumn withLa Merce, Barcelona’s largest street party.