Okay, you say it's not British because it was bought back from the US Army.
Here's my evidence:
Yes, because we gave them the prototype in the first place, specifically bringing the airship expertise in the partnership with Grumman. The US wanted our product, I didn't see our Army offering up the opportunity or budget!
HAV were a little known outsider who won the contract because they were the best. Along came the fiscal cliff and we bought it back for a song including all data and rights because it was our product.
Munk was British, it was his concept. Barnes Wallis before him was British, he designed the R100 and proposed the beermat list of challenges. Airship Industries was British which became HAV, who are based in Cardington. And have built an 'airship' which is mostly British made, excepting a skin which comes from the US due to their expertise in impermeable membranes with NASA spacesuits.
We predominantly make components for other nation's firms (A380 wings anyone?) but not this time. The chief test pilot is a Brit, as are the team. Oh, and it's registered G-PHRG...not N7077A!
I rest my case.
Whilst the jury is out, it occurs to me to add the Delorean DMC-12 to the list.
Great invention for travel back in time. In that sense somewhat similar to this
HAV balloon. Great for going backwards with the wind in the right direction of course.