It is with an absolute, unbridled delight that I discover that nothing much has changed. Plaça de la Font is absolutely alive, almost every table at every restaurant taken, a stage set up in front of the grand Town Hall in readiness for tonight’s show of traditional dancing, the atmospheric square packed with families where small children, teenagers and grandparents mix as if socialising with all ages is the most natural thing on Earth. It’s gone 11pm and the children still have boundless energy as they ride stabilised bikes, burst balloons and indulge in games of chase. This is Tarragona, a place I have visited many, many times before and…