The 1971 chart-topper was the latest product of the T. Rex team that helped create Bolanmania.
The 7 February 1970 issue of the magazine announced John as their Man of the Year.
On 16 January 1971, it was farewell Tyrannosaurus Rex, long live T. Rex the band and T. Rex the LP.
The live album was credited not to Lennon and Ono but solely to the Plastic Ono Band.
The UNICEF event featured John and George's first scheduled performance since The Beatles' last concert in 1966, and Lennon's last UK live appearance.
'Happy Xmas (War Is Over)' became a cast-iron Yuletide favourite, but its original UK peak was No. 4.
'Give Peace A Chance' was recorded during the couple's famous "bed-in" at the Queen Elizabeth Hotel in Montreal.
John Lennon/Plastic Ono Band, one of the most powerful statements of his entire career, made its debut on the UK chart on 16 January, 1971.