Series 9 Episode 9, and Series 10 Episode 1
For once, Mark Lamarr focused on screwing with a Phil that had only one L, resident guest and then-Kerrang-editor Phil Alexander, with a lightning sound effect and voice changer throughout the show. After a while, Sean, Richard Fairbrass, the other Phill, and guest Mike Wilmot were all contributing to the gag. Heck, Mark even brought it back in the next series, to mess with forgetful radio legend Tommy Vance.
(I don't own Never Mind the Buzzcocks, or any of the music mentioned or featured- rights belong to Fremantle International.)