Bob-Dubery
I find this a bit bizarre actually. Led Zep are BRITISH, for a start. And early on in their career they engaged in plenty of plagiarising of American musicians. But giving ageing rock gods a gong seems to be a good way of proving that you're hip and getting some votes.
Mick Jagger got a knighthood despite his protracted wholesale tax dodging, and Richard Thompson, of all people, recently got a reward from the Americana Music Association, so it seems that standards are neither high nor strict.