By James Nation If Rachel Reeves is serious about the need for greater investment, she needs to tell a story about why it’s more important than day-to-day spending, says James Nation When was the last time you heard about Labour’s ‘missions’? What is their overriding governing thought or story? Homing in on a message and then sticking to it is a challenge for any administration. When I was working in Rishi Sunak’s government we’d get asked all the time if the five priorities were still the five priorities and why those were the five. With the reset in Downing Street, next week’s Investment Sum…