Final answer:
UK fans accessed rock 'n' roll and related music through radio and record stores, overcoming its initial scarcity to embrace the genre.
Step-by-step explanation:
Fans in the UK accessed rock 'n' roll, country and western, and rhythm and blues music primarily through the radio and record stores.
With the American music scene booming due to artists like Elvis Presley and Chuck Berry, UK listeners sought these revolutionary sounds that blended electric instruments with the raw energy of gospel, blues, country, and jazz.
Despite the initial scarcity of this music in the UK, the demand for rock 'n' roll overcame cultural barriers, making the genre an international phenomenon. Importantly, it was through the mass media and the growing affluence of white America that this genre spread beyond its origins and reached British music enthusiasts.