According to online magazine the First Post, John Reid has privately assured Gordon Brown that he will not challenge him for the Labour leadership. Reid seems to have worked out that he simply would not have the support - which is probably true as most of those who want him to run seem to be Tory commentators trying to stir up dissension - and that the best way of staying in his post for more than one more year is to make peace with the next almost-certain leader.
In the same article, the First Post notes that Brown used the weekend's Cheltenham book Festival to talk ideas and humanity. He also apparently ruled out bringing in a written constitution. Both Brown and Cameron, interestingly, have both been flying flags about constitutional change, to the effect that they want to strengthen parliament and limit the powers of the executive. But then, politicians who aren't Prime Minister are often interested in that sort of change - until they reach the highest office themselves and somehow leave their reforming instincts at the door. It was Lord Hailsham who, in opposition, made disparaging comments about living under an 'elective dictatorship'. Safely back in office, as Margaret Thatcher's Lord Chancellor, we didn't hear much more from his reforming lordship on that issue!