In 1977, merely suggesting that the Queen was a moron (or a potential H Bomb) would get you banned from the charts.
By 1999, The Sex Pistols could have performed a duet with Eminem, three strippers and a donkey, and rolled Her Majesty around Trafalgar Square in a barrel, and nobody would have given a damn.
Times certainly changed quickly.

Punk took Great Britain (the entertainment industry and the general public) completely by surprise. At the start of 1976, there was little warning that the world of popular music would be turned upside down before the end of the year.
Today, early British punk records still sound exciting. At the time, however, they were also the epitome of nihilistic shock. They could not have caused more of a sensation.
In the end, punk did not so much die out as mutate and diversify. As liberating as the first wave of punk was, it was impossible to perform an endless loop of hyper-fast, bile-filled anthems as the musician’s ambitions broadened and their musical skills improved.