Do you think Labour are likely to do less? You've mentioned the railways for instance. If you stripped out the profit providers make at the moment and just ran things at cost, would Labour happily reduce the total spent on railways by x%? I'm struggling to see that happening to be honest, and suspect it's far more likely that the profit made today will go on higher salaries for employees instead.
Yes, because a lot of the additional costs now - franchise contest costs, legal fees (for contracts and disputes between contractors and NR, NR and franchises, franchises and the ORR etc) fleet hiring costs, track access charges, even driver wages* are either way higher than they were or didn’t exist at all under BR (or on a unified network like the French or German).
• not that they should be cut, but they certainly could undergo a freeze for a bit whilst the system is reorganised.
The reason driver wages are so high is of course down to the franchises not training enough for ages and getting suckered into luring each other’s staff away.