This is a quite interesting setup, Polly calls a conference to explain whats happened, with a dictaphone recording of Jamie to help her. A telepathic message has told people that a certain chunk of time is now restricted you can either bypass it or pay the toll - with some of your life!

The Doctor, Ben, Polly and Jamie arrive in a shadow world, like Earth but not quite, the Tardis has hit some kind of 'wall' in the vortex. A time sentive race have decided that they have the monopoly on time. This does have the feeling of an epic adventure. The conference, the telepathic message, a version or Earth without people, and possibly a race that could the Timelords a run for their money.

Jamie using the dictaphone to record his journey is a bit hackneyed. The amount of times its happened, when watching an episode, or listening in this case, where a charatcer decides to journal their story completely out of the blue, for no reason at all, but just what the plot needs, just stretches believability.

I do feel Frazer Hines as Jamie was underused here. it is nice to have both Anneke Wills and Frazer Hines, but for the amount of time he had, I'd of rather a two hander with equal time for the two.

A resonable story, worth a listen.