Herbert Brewer to be more exact. And yes, like most people, I thought it was Edward Elgar at first.
Brewer, Marche Heroique.
Elgar, Imperial March. Or rather, maybe this.
Similar, right? Or maybe you just need to be familiar with Elgar's music to notice it.
*EDIT* What? Elgar isn't in my spellcheck? Oh NOES!