I found a website that lists the following:
(who claims to have played with the Beatles during their "Pop Go The Beatles" sessions for the BBC "... because the BBC didn't think Ringo was adaptable enough for what they wanted at that time," among other things)
Also, let's not forget that Paul McCartney
played the drums on "The Ballad of John and Yoko!"
Rooftop Sessions - The Finest In Beatles-Related Fiction. July 2001 Issue up now! About.com BEST OF THE NET, April 2001! www.rooftopsessions.com