Interestingly, Led Zeppelin started life as the Yardbirds. Yea, I heard of them but never got into names of group members. Apparently, Percy is to do with Plant creating a stage persona with his long blonde hair, bare chest, colourful outfits, swagger and bravado. Just a bit of trivia.
I'd put it differently Phil. John Paul Jones was a session man, Bonham and Plan were in Band of Joy, as far as I remember Jimmy Page was the only Yardbird, and he was also a session man. JPJ and Page started pulling a band together when the Yardbirds folded, they briefly called themselves the New Yardbirds to fulfil some Yardbirds contractual gigs. But really there wasn't much linkage otherwise. The Yardbirds was a great band for kickstarting guitarists, they had Page, Clapton and Beck, about as stellar as you could get.