Rather to my surprise, I picked this up at the local bookfair. It is a series of messages between renegade Time Lady Iris Wildthyme, created by Paul Magrs and portrayed in Big Finish audios by Katy Manning, and her toy panda, portrayed by David Benson. The third chapter, in full, is:
I set the coordinates for Paris but went a bit off kilter in the Maelstrom, that mysterious region in which Space and Time are completely buggered up. Upshot is, I ended up here. It's some kind of space city in the middle of a jungle of flesh-eating flaming plants. LATER: Have found the bar. Full of space delegates. Some kind of conference, I think. Secret summit, accord-ing to the funny-looking fellas I've been sitting with. One in a jumpsuit covered in chocolate chip cookies. Another looks like a malevolent Christmas tree, but at least he got a round in, which is more than I can say for the Prime Minister of the Solar System. They reckon they're here for a clandestine rendezvous with evil alien robots from another galaxy. They're such a tease! You watch yourself with that Frenchy lady!
As will be apparent, it's very much an insider's set of jokes, with classic and new Who stories being infiltrated Zelig-like by Iris and Panda. Slight stuff, but it gave me a couple of good laughs. The offical cover price is a bit steep - I paid rather less!