Potential unfinished/cancelled episodes of BOOHBAH?

Dave Hope's Flickr account has a picture from a currently largely unidentified episode of Boohbah (you can see it here). We speculate that it may have been a screenshot or test photo for an unfinished episode called "Sweet Tea" (or "The Jar"), but it also means that there were at least a few episodes that were cancelled halfway through production and replaced with other ones (I'm not counting "Falling Oranges", which was finished and broadcast after three largely unsuccessful shooting attempts, and "Springy Sofa", which was shot during production of the first series, but for some reason not aired until the second series).

Is there any more information about - and photos from - potential unfinished episodes out there and, if anyone here has connections to anyone (at Ragdoll) who worked on Boohbah, can you reach out to them and see if they have any in their possession?