2-847-743 - Historic England Archive/Heritage Images

Laing workers pouring concrete to the deck slab of Structure 63, a bridge under construction in Section C1 of the London to Yorkshire Motorway (the M1). The caption beneath the corresponding album print reads 'Pouring concrete to deck slab 3' 6" deep. Continuous pour for 136 hours - rate 12 Y.C. per hour 2:1:1 concrete'.