Thanks for taking the time to do this video, very interesting. Being able to lock the two heads together is such a useful feature and must save a ton of time. I think the Wilson has better looks than the Wadkin eca, looking at them I also think the Wilson has a bigger table as in length. Also I like the little flip up shoulder stop in the table being much better than the wadkin effort. Date wise I would say early 60's for both of them, later models have the base made from welded sheet steel, I believe the early 50's machines had a completely different look and castings.
No worries. It's a great feature to have, some tenoners are just painful to adjust, especially if the thread is course and you only need to move a smidge. I can't remember the physical size of the eca, I swapped it for the wilson about 15 years ago, as I said, if anything I'd say the Wilson is slightly smaller but it is laid out very well.
Wilson machines! Absolute weaponry. The spindles, bandsaws, planers, all made to last. Such a shame they went bust as i would say they are same if not similar build quality to dominion, wadkin etc.