White South Africans didn't all originate from England or other British Isles. For example, many of my own ancestors came from France, Germany, Ireland yes, etc.). For one, English isn't my first language, it is my second language (or first additional language) - as it is for many white South Africans. We don't speak English very often unless we speak it in a formal work setting, at schools or universities. Or when we get odd tourists asking about lions walking around in the cities (wink). So yes, many South Africans (white and others) will speak English with an accent (heck, even the English speak English with a South African accent and some clear South African words). Hope this cleared it up a bit!