Please, I know as little about the Gondal verse as you do, have never seen Life on Mars en listened to but a few episodes of Cabin Pressure. But that all doesn't matter one little bit. AJHall guides you through all the intricacies, Gondal and Gaaldine are but two rivalling, neighbouring Kingdoms, like the whole map of Europe was at that time, and the Life on Mars and CP figures mingle quite nicely with the wonderful OFCs. Once you do take the plunge you'll be so happy.
Please do.