Good catch! Interesting that it goes all the way back to 1967. If there is a connection, I would it imagine it was more subliminal than overt (hoping that maybe the author himself will provide confirmation or refutation) as the main similarity seems to be in the tag line.
The closest that Spencer and Fleetwood Mac came to the sound of the Bonzo’s song was the BBC recording of ‘Don’t Be Cruel’ and their live version of ‘Blue Suede Shoes’ (I’m thinking of the unreleased performance from the Shrine Auditorium where the number became a medley bringing in ‘All Shook Up’ and ‘Whole Lotta Shakin’ Goin’ On’.
I can only imagine what Stanshall and Innes must have thought when they learned of a U.S. band taking the title as the name of their band some thirty years later.