Chalky, the way I do it, is by saving the picture (or make a screenshot) and than uploading it to the forum afterwards with the "manage attachments" button.
The website in question does indeed have has an option for embedding, but I also can't get that to work!
It looks like a Cab 11 Chevrolet C60S (bonnet, brush, solid mirror arms, 20inch wheels).
source:
https://historicengland.org.uk/image...P01/01/004/73#
edit: Sorry, I just noted you had already uploaded the picture!
