There was another Comet preserved in the UK and that was a much rarer Comet 2, ex-RAF. It was part of the magnificent collection of aircraft assembled at Strathallan in the 1970s by Sir William Robertson, tho sadly it did not survive the break up of that in later years. Here's a link to a photo I took of it back in 1976:
Comet at Strathallan Sept 1976 | Flickr - Photo Sharing!