"Maybe there is some lenient timekeeping going on at sports days now to make sure her name stays up there."
The former League of their Own panellist joked the school regard him as their "dirty little secret" because he doesn't get mentioned by them as much as their regal past pupil does.
He told the Sun newspaper: "I went to the same secondary school as Kate Middleton and she's someone they like to talk about.
"I've been sending them a letter each year saying maybe now it's time to put me in the school prospectus or on the walls.
"I feel like I'm their dirty little secret."
And it's not just his secondary school that have snubbed Jack because The Dragon School in Oxford, which he attended before Marlborough College, would rather "bang on" about the achievements of former tennis player Tim Henman than his successes.
He added: "It's the same with my first school [The Dragon School in Oxford] - all they ever bang on about is Tim Henman."