I have a question. The Chemical Brothers play guitar and bass?
Pretty sure Tom plays guitar, and (without wanting to be insulting) therefore bass as well.
Just in wikipedia I saw a part of the article of "Push the button" in the part of "Personal" in which Ed Simons said: keyboards, engineering, bass, guitar. I do not know if that's true.
Just checked the sleeve, nothing about it in it.
(https://pp.userapi.com/c841632/v841632013/4e28b/Y7nbbv5ejJI.jpg)
Does that answer your question?
https://www.youtube.com/watch?v=bw8e-4HO37M