What a shock and a loss to politics.
A highly intelligent man, skilled politician, expert horseracing tipster.
When he resigned over Iraq, he did so without bitterness, compare his departure with the 'will she, won't she' of Clare Short, also unlike Short, Cook never indulged in personal attacks against former Cabinet colleagues.
He would likely have rejoined the government once Gordon Brown was PM
, having patched things up with him (Scottish Labour politics is more of a snake pit than most).
Even from the back-benches, Cook was an important figure, he will be greatly missed.