Scraping the bottom of the barrel again......
I have watched this clip several times (Sherman V DD and nice Canadian Diamond T969, also Fordson of 27th Armoured Brigade) but only recently spotted the early CMP's in the background. It's pretty hard to tell, but I see at least two. My first thought was Ford F60H folding boat carriers, but on closer inspection I think they are 3Ton GS trucks pulling trailers with folding boat equipment.
source:
https://www.iwm.org.uk/collections/i...ect/1060008126
IWM collections; IWM A70 57-8