BB, re-nationalisation I guess would come under Option 3 but would not be considered by the govt.... unless the company's balance sheet was in extremis. It isn't.
Another option is to resurrect the Sale Act case run by AIPA. This would require a major about-face by the current Exec, as they were elected partially on a platform of stopping it... something in hindsight they may be regretting.
The case was never stopped, just discontinued. It wouldn't take much effort.... just a decent amount of cash to get it going again.