I have been wanting to see the A380 wing barge for over a year now, and finally I got to see it today. It is very impressive, and there is very little clearance with the bridges - careful use of tidetables must be needed to give enough draught for the barge not to ground, but also not too high or it will hit a bridge. The tide was coming in as the barge went downstream, presumably to give more control to fine-tune the steering near the bridges. A fascinating sight.