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Morning news and current affairs with James Naughtie and Evan Davis, including:

0750
Mackerel should no longer be eaten regularly according to the Marine Conservation Society. Bernadette Clarke, Marine Conservation Society's fisheries officer, and Ian Gatt, chief executive of the Scottish Pelagic Fishermen's Association, explain that the oily fish has been taken off the Fish to Eat list as overfishing means it can no longer be regarded as sustainable.

0810
Many schools across the UK have been closed this week because of snow: yesterday, more than 5000 in England. The education secretary Michael Gove told the Commons that he thought "everything can and should be done" to keep them open. Brian Lightman, general secretary of the Association of School and College Leaders, and the Conservative MP Graham Stuart, who chairs the Commons education select committee, discuss how the decision to close schools should be made.

0817
The huge increases in computing power that have been occurring over the last six decades are constantly being absorbed in new and different ways. Tom Feilden, Today's science correspondent, and Dr Shirley Ann Jackson, an adviser to President Obama, examine one of the latest phrases to
drop into public circulation: Big Data.

0821
Actor Ricky Sekhon got a role in Kathryn Bigelow's film about the hunt for Osama bin Laden and spent weeks wondering how best to go about playing the part. Mr Sekhon explains that he ended up playing the al-Qaeda leader, dead, peeking out of a body bag, and only on the screen for a a short time.

0832
The French intervention in Mali appears to be making some progress - French and Malian troops have seized two key towns - Diabaly and Douentza from militant Islamists. Andrew Harding reports from Mali.