I've been experimenting with some AI video software. They claim to be able to upgrade old "low quality" video to full 4K. I've taken my DVDs and produced an mp4 from Caretaker. I then washed it through Topaz, upscaling to 4K and "cleaning" the pictures. I've taken a picture from the result and here are the results:
Original Paris image #1:

The updatedd version, all be it from a different scene:

All I can say is wow. It most decidedly works. I will proceed to convert the remaining episodes and update the images from the site. That's going to take some time, but watch this space.