I do that too but never thought anything of it. I mostly used that voice when I was playing though. I never really made anything of it. That same voice came out once in a school play. I had only one line and every kid after that kept making me say it over and over again since they thought it was amazing that I could put on a Brittish accent. I think I was in 4th or 5th grade. When I played with my friends I had a Brittish accent too. But like I said I never really gave it much thought it was just one of many voices I used depending on the different roles I played. I had a deeeeeeep voice that scared my cousin when we were playing cops and robbers needless to say we didn't play that one too often xD