Oh wait you’re serious. Let me laugh even harder.
Efficiency leads to profits and thus dividends. The government cares more about politics than efficiency. Look the the problems southern have had because the government insisted on getting rid of guards - they effectively nationalised southern (GTR) years ago because they refused to let the private sector run it how they wanted.
Compare with chiltern who converted the Chiltern line from a service about to shut down under the government in the 80s to a leading toc massively increasing service and options