Born in the UK she returned to Nigeria, went to school and graduated as a doctor there. She is now in the UK working. Her English pronunciation was appalling and if it was not for the fact that I spent a lot of time dealing with Nigerians both here in the UK and in West Africa, I would have had great difficulty understanding her.
This is all about a test of one's ability to
speak English and not a test of one's
pronunciation or
dialect.
I have great difficulty in understanding the Scots and the Geordies and most modern day television announcers, but I dare say they can all theoretically speak English.