I want to know the answer to the following question:
When did British post-punk emerge?
All the background I'm provided with is that "American critic Greil Marcus characterised "Britain's postpunk pop avant-garde" in a 1980 Rolling Stone article as "sparked by a tension, humour and sense of paradox plainly unique in present day pop music"—as well as media figures such as BBC DJ John Peel, while several groups, such as PiL and Joy Division, achieved some success in the popular charts.". Is that enough to answer the question?
Answer: no