Beatles, Cat Stevens, David Bowie?

(I think this is the right place to discuss this? Sorry if it's not, feel free to move it - I'm still getting a feel for the forums here )

Before I became a Beatle fanatic, I was very much into the music of Cat Stevens and David Bowie - both British contemporaries of the ex-Beatles in the 70's, as I understand it.

I have snooped around as best I can, but can't find anything relating Paul, George, Ringo or John to Stevens or Bowie, in any way. I don't know, I suppose the musical connections are slim (except perhaps in the case of Cat Stevens and George? Maybe it's just the spiritualism and the facial hair ) but I'd have thought that these prominent artists, being from the same country and decade, would have crossed paths somewhere along the line?
I know their relationship with the Rolling Stones, Donovan and Bob Dylan in the 1960's is well documented, but I was just wondering if any of you knew of any connections with Bowie and Stevens later on.

The reason I ask is because I recently read about John's association with Elton John, just before he died, and it got me thinking about how the boys may have come into contact with other artists?