Most images and material about the making of the show have been lost in the mists of time, but a number of the animators who worked on the show had their own websites featuring some material about their work on the project.
Most of these personal sites have disappeared, thanks to the trend towards social media but the below, very thoroughly-researched article gave a wealth of links to wayback machine copies of those sites, from which some images, files and animations could be recovered:
British Comic Characters Profiled | Dan Dare - downthetubes.net
