There is certainly a Dan Dare Comet 4 at Wroughton. Don't have much of a clue as to whether it being the same one though.
Conan
PS The Science Museum at Wroughton is wonderful fodder the the peeps on ths forum. A little known Gem - so if you are that way, it is worth popping in, if open. Bet you would spend a good few hours there :-)