Many thanks. I've got the latest TacPack installed and registered properly, the VRS Hornet works fine but the stores display on the Warthog still isn't playing ball. Is it simply a case of open the window and click where you want the stores or am I missing something?
Edit : The IndiaFoxtEcho F-35 and Typhoon work fine as well and they seem to use Tacpack and a weapons loadout screen to select bits and pieces.
Apparently the build number (looking at the relevant text file in the aircraft folder) is V2.1-140305-1124 for the version of the Warthog I downloaded.