Floods, nerves and piano tuning — Henrietta Bredin goes backstage at the world’s biggest music festival, an epic feat of logistical planning.
Fleets of music stands, umpteen water bottles for thirsty singers, coaches for travelling performers, cushions for cellists with backache or fans for the hundreds of people who stand, sit or lie on the floor of the Albert Hall arena and gallery during the great summer festival of BBC Promenade Concerts — the statistics of…