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The CBI tells us it was a mistake to register as a campaigner against Scottish independence. The business lobby registered last week with the Electoral Commission as a campaigner against Scottish independence. The Electoral Commission said it has received the CBI's application to "deregister". It is currently considering whether this is possible... and it will make a public statement when it has reached its conclusion.

In Slaviansk - the most volatile of the eastern Ukrainian towns where pro Russian separatists have seized official buildings - contact has been lost with a delegation of international observers. And Moscow may be facing a new round of sanctions if it doesn't act to rein in the separatist groups in eastern Ukraine - after a diplomatic conference call today between President Obama and several European leaders. Moscow's credit rating has been downgraded by the US-based agency Standard and Poor's. Standard and Poor's told us why.

190 girls are still missing after being abducted from their school in northeastern Nigeria last week. There's been no communication from them, or from their suspected kidnappers, the militant Islamist group Boko Haram. And not much from the Nigerian government - although it has now held a top level security meeting. A government spokesman did give the World Tonight an interview and said the delicacy of the situation had meant the government could not give ongoing comment.

The life story of Alan Turing, the mathematician who worked with a team at Bletchley Park to crack crucial German codes during the Second World War, has been set to music. Our reporter, Paul Moss, has been hearing from the composer and the musical director of this new work, named "Codebreaker."

With Philippa Thomas.