So we went to see Nick Hornby interviewing Elvis Costello at the Festival Hall the other night, which was terrific. The added bonus, was that as we came down in that very scar, fast glass lift with the whooshing sound effects we got to the ground floor and saw this. Impromtu tango dancers practising in the stariwell next to the lift and toilets. I grabbed my camera and in the crappy light I shot these...