Nice film! Just before the middle there is a good shot of a Scammell Mechanical Horse (No, Stuart, NOT a Mechanical Elephant!). The Scammell MH was the predecessor of the lovely Scarab which were a common sight when I were a lad, ooo 'eck by gum, I've gone all Fred Dibnah! I love Scarabs, no visit to London was complete without seeing them scuttling round with stacked trailers.
Was it Larmar who made the wonderful "Spinal Carriage" contraption, to lie down on while driving, for those with spinal injuries?