Been ages since I visited, hope everyone is well.
We all end up labeling music and that's natural, but I would disagree that "rock 'n roll" started in the UK, it was pretty much a US export. The Stones & The Beatles certainly started out playing rock n roll American standards, although The Stones may have been more blues influenced. While I'm not sure if any of the bands mentioned credited Elvis as a catalyst for their entry into music, many other British artists do.
Cream were always a bit of a mish-mash - Clapton from the blues and Bruce and Baker from Jazz. Interestingly, I recently watched a great documentary on Cream, Baker seemed very bitter over Bruce and Pete Brown getting royalties for most of Cream's output.
If memory serves me correct, Deep Purple came more from British pop than rock n roll.
Zeppelin? I love that band but they nicked so much it was almost criminal. Well, considering that they later paid royalties and gave credit to others for their stuff, it probably was criminal
Although I don't have all of Steve's output, what I would say is that he keeps true to his principles (perhaps to his financial cost). It's actually hard for me to work out where his influences may have come from, hence some originality.
Anyway, just my opinions, late here in the Pacific Northwest and ready to call it a day.
As far as clothing goes, fashions come and go, I'm hoping that the loon pants I bought at the Great Western Festival near Lincoln (UK) in 1972 will come back in fashion soon, I'm fed up with comments at work.