"Stephen Fry Does The Knowledge" is a single audio CD, in which Stephen Fry talks about knowledge - what we know, the value of what we know, how we access that information etc. Contrary to the title of the CD and the misleading image on the cover, it is not purely about "The Knowledge" as studied by London taxi drivers. That is the starting point, but it is not the main subject.
I had listened to many audio books read by Stephen Fry. He is one of the best readers/narrators that I have ever listened to. So, listening to him for the duration of one CD is never going to be difficult. However, the actual material on this CD is pretty poor. It isn't structured particularly well, just drifting along, and then ending without feeling like it had actually got to an end. Audio books, whether fiction or non-fiction, should have a beginning, a middle and an end. That's pretty basic. Unfortunately, this audio CD seemed to just ramble, without any proper conclusion at all.
Does the listener learn anything particularly useful? Not really. There's one bit about memory palaces, but that's about it. Even that was fairly superficial and something that I have heard explained better elsewhere.
So, one of the best voices around, nattering for about one hour, in a superficial way, about not a lot. Whether an in-depth look at "The Knowledge" (London taxi driver knowledge), or an in-depth piece about knowledge, memory, the brain etc, the material could have been so much more interesting. The structure could also have been much better. I wouldn't say to not buy this, but I also wouldn't actually recommend it either. It's ok, but it could have been much better.