I can't really find an EMI contact page or email address. I believe in the past for the Wall petition, we wrote comments under the Pink Floyd press release, and for Aqualung, we went through EMI Canada (which I don't think would be the best way to go about it again).
Looking at the credits for the Aqualung reissue, the main people to talk to on this matter would probably be Tim Chacksfield, who was in charge of Product Research and Co-Ordination, as well as Ray Shulman, who was in charge of authoring the DVD and Blu-Ray discs for the release at Isonic. (He also happens to be the founding member and bass player for legendary prog rock band Gentle Giant).
I believe Chacksfield has been in contact with the Jethro Tull forums concerning photos and memorabilia scans for these releases, so maybe they can contact him.
Also, I'll look for contact info for Isonic. Maybe the Gentle Giant website/Facebook page/forum can get in contact with Ray.
I'd imagine Neil (Wilkes) knows how/who to get to at EMI regarding this.
Also, i feel that if it were explained to the producers of these EMI CD/DVD-V sets that creating an advanced res DVD-A would cost them no more money to make than a DVD-V.. and the sonic benefits, plus potentially increased sales (no matter how small, the labels need to wring every sale they can get nowadays) from audiophiles, beyond Tull fans and surround nuts.. then we would see any/all future releases of this type from EMI on CD + DVD-A sets.