ofc there's a question on how to spend aka the output, and a complete rethinking for European countries is needed (i.e production of drones, unmanned vehicles etc.). if anything, lessons from how US conducts the war in Iran - aside from Russia/Ukraine war - can't be more clear.
it's a chance to decouple from dependency on Americans in armaments. sadly Europeans are too slow to adapt. it's not a problem unique for UK though.