The man leading the government’s campaign against an independent Scotland was responding to a challenge by James McAvoy.
This is Alistair Darling. He's the man who's heading up Britain's campaign to keep Scotland a part of the UK. And here he is taking the ice bucket challenge.
Alistair Darling / Via Twitter: @TogetherDarling
Darling did the challenge for Gordon's Fightback, a campaign raising money for motor neurone disease.
Davie Clegg / Via Twitter: @davieclegg