FWIW, it's a nice live album, but doesn't strike me as one of the great live albums of all times. Unless there's some other bootleg with more. The only one I've found is... 8 songs. Tame audience (or they just weren't recorded?)
If you can find a boot of Led Zeppelin's '69 recordings for the BBC you'll have the same impression: after each song the audience claps politely, as if they'd just heard some chamber music. I had an image of them all in short hair, dressed up, and sitting politely in wooden chairs or folding chairs.
Perhaps they new the recording was for BBC broadcast (was it broadcast?) or perhaps that's just how things were in those days. OTOH, I visited London as a small child in 67 or 68 and my memories, even now, are of a pretty swinging place.
Here's the songs on the original release: https://www.youtube.com/playlist?list=PLXRKTcRs-Xs7RqWKl8hqt...