Managed to get a copy of the Aeronautica Imperialis Companion.
The perfect addition to your games of airborne combat in the 41st Millennium is here in the form of Aeronautica Imperialis – Companion. This expansion collects new rules, aircraft, and factions, along with existing content previously found within White Dwarf magazine, allowing you to field squadrons from the Necrons, Asuryani, and Adeptus Astartes. Experience a deeper dogfighting experience with detailed expanded damage rules, new Ace abilities, and the challenges of limited ammunition. Novice and experienced commanders alike can use these rules to revolutionise their Aeronautica Imperialis games across a suite of new matched play scenarios.
I had planned to buy it from my local gaming shop, but they didn’t get any in. I had also tried a gaming shop in Birmingham, but I was a week early. I tried a few retail branches of Games Workshop as well, but they weren’t stocking it or had sold out (I didn’t ask). I did consider ordering it online, but at both full price and having to pay P&P I was a little hesitant.
In the end I managed to pick up a copy from Dark Sphere in London. Excellent.