[quote name='timmo' timestamp='1450217257' post='2930729']
Point 4. I still maintain that by the end of 1979 more than 51% of the UK knew who Sid Vicious was, which would be most people.
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While I hesitate to interfere with your maintaining, I feel it behoves me to point out that, in the late 70s, 38.8% of the country were either over 65 or under 10. There was a further 8.7% who were first generation immigrants or the immature children of first generation immigrants. I can't prove it, but I suspect that the Sex Pistols made pretty poor inroads into these demographic groups.
If we assume that 10% of pensioners and immigrants knew who Sid Vicious was (and this is a generous assumption) then you need slightly over two thirds of the rest of the country to be able to know who he was and that he played bass. This is improbable in the extreme.