The UK arms industry is fairly successful and the number five exporter behind the USA, Russia, Germany and France with China as number six according to the Daily Mail.
https://en.wikipedia.org/wiki/Arms_industry#World.27s_largest_arms_exporters
Industrial espionage is hardly anything new but I agree it must be hard to prove exactly who is behind every hacking attempt (and I am sick and tired by the word cyber for now, and so is my spellchecker).