There are so many possibilities and Paul said himself he got the name from his own uncle Albert. I think Paul was using it metaphorically in the way the American's reference Uncle Sam. Paul seems be poking fun at the fact that the Beatles were not together anymore and he had not been bringing in the tax dollars to the British Empire because they had not done a bloody thing all day as opposed to the constant output the Beatles were bringing in to the tax collectors pockets. The vid showing he and Linda living in Scotland on their farm living free and enjoying themselves was not the regimented worker bee that he was raised to be. He is going to Reign on his free land. Hands across the water, heads above the sky seems to reference symbolism of his own family in Linda and her child being from America and now they are one family united heads above the sky...the music really mixes the American and the English together in a surreal way that is pure genius. Definitely seems like they were smoking a bit of weed and maybe some psychedelics, the Admiral Halsey notified me sounds almost saying he had to have a buzz or he couldn't get to sleep which is common for daily smokers...All in all the song says much more than any definition or lyric could explain...
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