I am not convinced that nationalisation would help.
Some aspects of "the railway" were better in BR▸ days, but a lot was not.
Things that were better under BR
Train length and capacity
Passenger comfort, sprung seats and better legroom.
Luggage space, even local services had van space for cycles and heavy luggage.
Catering on almost all intercity services and many outer suburban ones as well.
Fares, relative to incomes were generally more affordable, and also simpler.
Things that have got better since.
Many services are more frequent.
Air conditioning on almost all long distance trains and some local ones.
Disabled access generally better.
Digital displays for train information and other announcements.
Safety has generally improved.
Some of those got better, would have inevitable happened under BR, likewise many of those that have got worse since BR would have happened.
Changes to the way the National railway is operated and maintained will be changed by an in coming Government,
GBR▸ will happen its just what shape it will take