Hello Helen! I'm not a native speaker, but I think both forms are right. But if you decide to use the word "programs" (or stations, for example) the word "radio" would have to be in the singular: "I always listen to English radio programs". And by that I understand that you listen to radio stations from England. I would say: "I always listen to radio programs in English" instead, if you mean programs that are presented in English, but from any country.