Its from when they were recording Be Here Now. The pic is in a book called Was There Then by Jill Furmanovsky. Ashcroft and Patsy Kensit and other people around Oasis at the time came into the studio to join in on backing vocals on one of the songs. I forget which, maybe the nah nah’s on All Around The World
Liam only does one thing all the time. He sings out of his nose and just stands there stretching his neck to get his mouth at the mic with his arms behind his back. No variation in any of it.