Dave, you can use
KeepVid: Download and save any video from Youtube, Dailymotion, Metacafe, iFilm and more! to download the episodes from YouTube to your computer. Just copy/paste each part's link into the box provided. RayG's post above, (Post #21), has the links. They're available in 480p and 720p HD. I haven't watched them myself yet. I'll wait until all 3 parts have downloaded, then put the bits back together into one full episode. I also just added them to the forums' Video section in 'Instructional/Demonstrations', but they won't appear immediately, not until they've been vetted by the powers-that-be. Edit: I should have added - after pasting the link into KeepVid, press the 'Download' button to the right, (not the ones immediately below the text box, they're just ads), then a list of available formats will appear. Right-click on the one of your choice and 'Save Target As' to your computer. (IE) There's also an equivalent in Firefox etc.