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This has been discussed ad nauseum in numerous biographies of The Beatles, but John Lennon was the least "working-class" of The Beatles. Only Ringo Starr, who grew up in an impoverished area of Liverpool, was deemed as working-class by Lennon, McCartney, and Harrison. Harrison's household was a bit nicer, as was McCartney's, but it was Lennon's upbringing by his strict Aunt Mimi that was truly middle-class in regards to the comforts of home.
You can check out this link to Lennon's childhood home at the National Trust website:
http://www.nationaltrust.org.uk/main/w-vh/w-visits/w-findaplace/w-mendips/w-mendips-house.htm