I’m not going to go into the performance history for this, but I did see a piece on BBC London news about it. Unfortunately, I missed the play in all its runs.
It has been recently archived in audio form here:
https://archive.org/details/THEBIGLIFE
Here is a scene from the start of the play which I can only link to:
https://www.youtube.com/watch?v=YQKVUYvsZ8I
Laci the dog's Blog 