Last week, there was a surprise visitor to the Treasury: Gordon Brown. The former prime minister and chancellor secretly returned to his old digs for the first time since he left office 14 years ago. According to onlookers, Brown visited his old office as he caught up with the new chancellor – and his friend – Rachel Reeves. What was discussed? Many have speculated that among the topics on the agenda was the winter fuel allowance, a policy ushered in by Brown and now amended by Reeves.  Elsewhere, Tony Blair has been doing the media rounds promoting his new book and giving his thoughts on leadership. Should Keir be listening? Are interjections from former prime ministers ever helpful?  James Heale speaks to Katy Balls and Patrick Maguire.  Produced by Oscar Edmondson.