The first film shown in the UK was 'South Pacific', released by 20th. Century Fox in 1958. There were Cinemas converted to show the film, Certainly Manchester, Birminghame, London, Cardiff etc. TOD-AO was created by Mike Todd, together with American Opticle. There were a number of releases, including the 'Sound of Music' mosy were shown in London at the 'Dominion' Totenham Court Road - Sound fo Music ran there foe 6 Years. TOD-AO was a 70 mm film, as apposed to the traditianal releases which were 35 mm stock. The Ratio of a 70 mm Screen was 1 - 2.2, meaning for every fot high the width would be 2.2 foot wide.
Hope this helps! Good luck David (Hope you can release your production in a cinema near you (It would today be an IMAX screen)
Peter