Independent, Thursday.
"In a response to a letter signed by 120 MPs demanding that the BBC stop using the term on the grounds it gives undue credibility to the Islamic extremists, Lord Hall of Birkenhead (Head of BBC) warned that using an alternative would be "pejorative".

But he accepted using the term 'Islamic State' on its own could be misleading and insisted the BBC would "redouble our efforts" to use caveats such as "so called Islamic State group"."
http://www.independent.co.uk/news/uk/politics/the-bbc-must-be-fair-to-isis-head-of-broadcaster-rejects-calls-to-stop-using-term-islamic-state-10359806.html