Walking across the Charing Cross footbridge, wishing the Thames didn’t look muddy no matter how blue the sky, I spied what looked like a Safeway supermarket attempting liftoff from the opposite shore. Actually, it was Royal Festival Hall. The building consists of a multi-storied cube topped with a plain barrel vault. You’d never suspect the interior was devoted to music and dance – it could easily be a widget factory. But gratitude is due the city planners, who plunked RFH down in 1951 when the South Bank was littered with little else but closed factories and depressing detritus from the war. This year the hall reopened after expensive refurbishment, with public promises that its bad acoustics had been remedied.