Ex-Beatles Paul McCartney and Ringo Starr attended the U.K. premiere of the documentary ‘George Harrison: Living in the Material World’ in London on October 2, as did Yoko Ono and Olivia Harrison.

The surviving members of the Beatles have once again gathered around Harrison as a uniting force just as they did when all four members were (and weren’t) getting along.  Paul and Ringo were joined by Beatles’ producer, George Martin, as well as Rolling Stones guitarist Ron Wood.

“Every time I see something to do with George, it brings back more memories than you would believe,” McCartney said, according to Billboard. “He was my little mate on the school bus. A lot of fond memories. He’s sorely missed by us all.”

Martin Scorsese’s long awaited documentary on the “quiet Beatle” entitled, ‘George Harrison: Living in the Material World’ covers Harrison’s artistic and personal life, including his spiritual and philanthropic pursuits. The film, which features interviews with McCartney, Starr, Eric Clapton, Tom Petty and others, will air on HBO in two parts on October 5 and 6. A home-video release is set for 2012.