Every Monday Craig makes a round trip from Sheffield to assess the structural stability of the buildings still standing at Finsley Gate. Surrounded by litter on land and on water, we reflected on the fascination of what gets thrown out and on the happy associations these discards can sometimes trigger –  for Craig the sighting a Raleigh Burner covered in mud at the bottom of a drained lock (the hot transport item of his childhood). I got all enthused over a marble.