Here is a short clip showing a Series 1 on the 'Miller Bridge' aka 'High wire act' I had seen still shots from the clip, but here is the very short clip along with others
https://www.youtube.com/watch?v=moXwnA8i260and here are some images from the Royal Engineers training handbook 1963
anyone want to try and put it together LOL not me cheers Dennis
ps I found the clip in another site then located it in youtube,,.