ElectricTriangle said:

Wikipedia says (and my memory somewhat confirms) that George Carlin also redubed series one and two.

That would mean there are three dubs for the first two series: George Carlin and the UK/US Ringo.

Carlin did redub Seasons 1 & 2 for the US, since Ringo Starr didn't do all of them. Michael Brandon also redubbed many Season 6 episodes but they were TV only, and I don't have them, so it will be somewhat incomplete (and his narrations are terrible anyways).

I might not be able to use Starr's US dubs because they're all on VHS tapes and I do have them all, but the sound isn't great because there are crackle sounds throughout some of the tapes, unless someone knows a good way to get rid of them?