This was incredible. I was taken by surprise at how good it is. There is a very strong central premise, a world where you have to pay to speak, and it is explored really well, the writing is excellent. As for the narration, I think the performance by Jacob Dudman is genuinely one of the strongest I have heard in any audiobook. 

This is a very good Doctor Who story, but frankly I would also recommend it to people who have never seen a Doctor Who episode in their lives.