Anyone feel to correct me if k get any of this wrong, but punk as a genre evolved primarily in a cosmopolitan London ( unsure how much other English cities contributed - someone else can comment) where working class locals and immigrants from countries from across the British empire that had immigrated to London brought their local music with them - first wave aka, reggae, rock and roll, dub(?) all influenced young working class londoners and influenced the development of punk which was firmly rooted in class consciousness, a diy ethos, and rebellion against the rigid classist system of post war England.

Everything you’re talking about came later.

You might not necessarily hear the musical influence of some of these genres in the first punk bands that became well known, but the cultural impact of fans of these genres of music was integral to the development of a punk rock ethos that embraced working class solidarity, rebellion against authority, and diy.