I have recently acquired what I thought was a Sex Pistols 1977 bootleg, Spunk. However, on playing it, the record is obviously a recording of Led Zeppelin... By checking the serial number (FW 8214) it appears to be copy of Ballcrusher...but the label is clearly from the Spunk album (Blank Recods plus all the Pistols' song titles. Does anyone have any knowledge of this?