Comment by rgblambda

Would that not be covered under the UK-EU Free Trade Agreement or the UK-EU Security & Defence Partnership?

And if it were the case, then Eurofighter isn't independent of the UK either, as it's one of the main stakeholders and manufacturers.

I think your previous comment explains it better. The maintenance and logistical complexities are being experienced by countries that weren't initial adopters. The UK remains an initial adopter and manufacturer for Eurofighter.