Thanks to Larry Grogan's blog I have discovered that Billy did do at least one other recording with Johnny Brantley:-
Atlantic 2319 Gate Wesley & Band (Zap Pow!) Do The Batman/?
This Vidalia production features Billy on vocals with a song cashing in on the 60's Batman series. It starts with a crash of thunder and Billy screaming "Batman Baby" and has crunching back beat with plenty of atmospheric "Batman" sounds as the band cooks. Love the stonking horn part - as Billy shouts out.
To be honest Larry does a better description than me and if you pop over to his blog you can listen to the side as well!