Come on WAV-Jim is so much better informed and understanding of the process of traditions than you. Every name on his list is very carefully chosen to represent known English traditions, including Heavy Metal (the Midlands), drum'n'bass, and English pop, all pioneers and all quintessentially English. Rock is a form that has grown out of British tradition as well as American. Even American rock, which has its roots in blues and Appalachian folk music, has strong connections to our traditions.
And the disco was invented by Jimmy Saville, a venerable Englishman if ever there was one.