Some politicians have as their personal mantra quotes from great leaders of history. Sarah Sackman’s comes from her bootcamp instructor. The courts minister and MP for Finchley and Golders Green can be found in her time off running around in a field lifting weights and doing press-ups, as her coach exhorts her to “go with the plan, not with the mood”. This is, she says, a good lesson for politics. She acknowledges that “as a government, there have been times when perhaps we’ve allowed the mood to deviate from the plan”. Sackman is determined not to allow that to happen...