It is pretty self-explanatory that a loss of access to the common market paired with import duties and regulation issues connected with such things as exiting EASA and so on and so forth will hamper the UK industry.
Airbus is very much an "EU corporation" and having wing production outside of the EU and then having to deal with the hassle that means will be an end of said production - eventually. It could take a different turn *if* negotiations would produce a result that avoid the worst issues.
People voted for Brexit and for isolation doesn't seem to concerned about the global nature of the economy and that a lack of access to the common market will hamper different industries - not to mention that UK production become pretty "inconvenient" when it turns out that those products are "third country" suddenly and subject to import duties and regulatory issues.
The best solution under bad circumstances are a "Deal Brexit" where UK simply remain as "part members" of the EU one way or another, including access to the common market and EASA rather than a "Hard Brexit" where they are out of everything.