I watched some old english films and tv shows such as Sherlock Holmes and almost every character pronounced the 'R' rolled in some ways. Not always but in many words. They were all born in England. I found it so unusual. I mean I read somewhere that native English speakers have to practice to roll the letter 'R' because it is hard for them to pronounce. In my language it's natural that we pronounce the 'R' rolled in every word but in English it sounded strange.