Have you seen this - https://www.worthpoint.com/worthopedia/vintage-ed-deane-beal-ltd-cooking-304913284
or https://forums.overclockers.co.uk/threads/what-is-it-ed-deane-beale-no1-cooker-thingy.18612747/ ? Post #14 gives a good explanation.
It doesn't have wheels, but it looks like your photo.