Ascot Sound Studios

Ascot Sound Studios was a tape-based analog recording studio, built by John and Yoko in 1970, on the grounds of Tittenhurst Park.
Lennon built the studio, which featured eight recording tracks on one-inch open-reel tape and a sixteen-channel mixing console, so that he and wife/collaborator Ono could record without the inconvenience of having to book studio time at Abbey Road or another location. They could also avoid negative pressure from EMI and Apple Records staffers, and members of the British public, who disdained Ono's avant-garde stylings and tried to persuade Lennon to make more "sellable" music, as he had with the now-defunct Beatles. (Chance encounters with other ex-Beatles were likewise avoided.) Technical personnel and outside musicians were summoned as required, kept on standby, or stayed at Lennon and Ono's guest quarters (as they did for the Imagine and Fly sessions) if necessary, to make records that satisfied the two.
First to be recorded were the twin Plastic Ono Band albums (portions of which were also recorded at Abbey Road), released simultaneously in December 1970. (Lennon's rose to #6 in the Billboard charts, while Ono's - largely recorded in a single night of jamming with Lennon, Klaus Voormann on bass and Ringo Starr on drums - barely made the Top 200.) The following year brought Lennon's best-selling Imagine, with Phil Spector as co-producer. George Harrison joined Lennon, Voormann and Starr at Ascot to play on "How Do You Sleep?", a song that criticised the odd ex-Beatle out, Paul McCartney. The album sessions were extensively filmed, and the footage appears in both the Imagine: John Lennon documentary and a separate documentary about the making of the album.
Recorded at the same time as Imagine was Yoko Ono's album Fly (whose title song was the soundtrack to their movie of the same name), and these appear to be the last recordings the couple completed at the studio.