From PaulMcCartney.com:
The mysterious Thrillington was an instrumental cover version of Wings’ 1971 album RAM, recorded that same year at Abbey Road Studios, under the pseudonym of Percy “Thrills” Thrillington. Paul produced the album while Richard Hewson (who had previously worked on The Beatles’ Let It Be) arranged and conducted. Thrillington was shelved following the formation of Wings and finally appeared, after a teaser ad campaign in the press, in 1977.
Jun 15, 1971 • Songs recorded during this session appear on Thrillington
Jun 16, 1971 • Songs recorded during this session appear on Thrillington
Jun 17, 1971 • Songs recorded during this session appear on Thrillington
Jun 18, 1971 • Songs recorded during this session appear on Thrillington
Press conference at Los Angeles
Nov 27, 1989