A few weeks back I had a lovely sunny Saturday evening “messing” about on the river in the name of “work”.  The photoshoot was to record one of the most important milestones of the Forth Replacement Crossing: the arrival on-site of the cylindrical caissons which will help form the main foundations for two of the bridge’s three towers.     I couldn’t help breathing in as the caissons “slid” underneath the Forth Road Bridge without any……..