Boris Johnson has claimed the treatment of a veteran BBC radio DJ who says he was "forced" to quit because he accidentally played a song with an offensive racial term in it was "utterly disgraceful".

BBC Radio Devon broadcaster David Lowe found himself in hot water after airing an 82-year-old version of The Sun Has Got His Hat On which featured the lyric: "He's been tannin' niggers out in Timbuktu".

Johnson said Britain was living in a "Boko Haram world", in reference to the terrorist network that kidnapped over 200 schoolgirls in Nigeria. Boko Haram forbids Muslims to take part in any political or social activity connected to Western society and has killed more than 1,500 people this year.