Short answers, pulled from the story.
Paul McCartney withdrew to his farm in Campbeltown Scotland on the 20th of September 1969 following a band meeting where John Lennon requested what amounted to a divorce from the Beatles. This move followed widespread rumors in America that he had died and journalists tracked him down at High Park to dispel these three-year-old Paul Is Dead rumors.
McCartney used a recently delivered Studer four-track tape recorder without a mixing desk or VU displays to guide recording levels during sessions from December 1969 through January 1970. He described his setup simply as Studer one mic and nerve while playing every musical instrument on the album including acoustic guitars electric bass keyboards drums and various percussion instruments.
The first taped portion lasted only 45 seconds and featured The Lovely Linda which included McCartney giggling at the end despite being intended merely as equipment testing material. This performance became the official opening track alongside That Would Be Something written earlier in Scotland and the instrumental Valentine Day with three selections ad-libbed on the spot.
Ringo personally delivered the letter rather than sending staff which caused McCartney to react badly by telling him to get out while threatening payback consequences despite other Beatles backing down over final timing issues. McCartney had discovered Klein arranged postponement but received assurance from George Harrison that April 17 would proceed as planned before Phil Spector reported completion allowing coordination with a New York premiere scheduled for April 28.
A Q&A package released on the 9th of April explained reasons behind creating the solo album describing its theme as Home Family Love compiled with help from Derek Taylor Peter Brown Apple executives. Questions imagined about potential splitting included whether break might be temporary permanent based business personal creative differences stating no missed drumming contributions nor envisaged future writing partnership with John Lennon.