Many people listen to the BBC World Service and other BBC radio channels so as to improve their English. Torsten and I have suggested those who participate in the 30/30 Challenge to listen to the BBC as it provides you with an excellent opportunity to listen to authentic English. However, it happens that many experts consulted are foreign, and thus a foreign voice may very well be dominant in a BBC programme. What do you think about this? Should audio materials where 100 per cent of the speakers are native speakers of English be used instead of the BBC where you get exposed to non-native Englishes quite often?