The British Technicolor lab was one of the last to close (a few years after the last US labs shut down), which is why most Americans haven't had the opportunity to see one of those prints. Star Wars was right on the cusp, which is why no Technicolor prints of ESB or ROTJ exist.

It's good that people saw this- I hope LOTS of people attended, and brought their kids!!!

FWIW, supposedly Technicolor d-t/IB prints aren't good candidates for video-transfer due to their density (according to Robert Harris, anyway).