DENCH-and-PALMER wrote: DVD Files listed it as 1 of a 3 parter. Many other sources have.
I think the problem with that is that most of the sources claiming Utopia as part 1 of 3 stem from the earlier sources which went against the showrunner's wishes.
Now, slightly off-topic, and maybe this would belong in a different thread, but I don't consider Shada to be the real story #109, simply because it was not televised.