Alistair Darling
He also played a key role in the campaign to stop Scottish independence.
The prime minister's choice to run No.10 was Treasury official under Labour's Alistair Darling during 2008 banking crash.
The UK government may have to borrow £372.2bn this year. How the hell do we pay it back?
Former prime minister says party's only Scottish MP "gets it".
Former Labour chancellor says lack of clarity on second referendum saw party "taken to the cleaners" at European elections.