Let's look at some actual numbers from privatisation:
Water: when we sold it the government took on the debt on the agreement that shareholders would use profits going forward. To date they've taken on debt of over 50 billion. Guess who pays that? Yup, the consumer. Your bills are over 25% used to service that debt and yet those same shareholders have in the last decade alone paid themselves over 20 billion in dividens - that's almost the entire profit less 700m.
So just to be clear your bills are substantially higher in order to finance Improvements, maintenance etc. and yet we don't own it, we just watch the profits head off shore to a small number of wealthy investors.
The national grid: guess what, they're doing the same. Paying out the vast majority of profit as dividens and passing the cost of running and improving the network onto the consumer. Still at least competition has driven prices down you say. No sir, I'm afraid not, not only are bills higher but the energy companies have been found guilty of fraudulently overbilling the public to the tune of billions.
Still at least those off shore tax shelters are doing nicely.
British Rail? Let's see: less reliable? Check. Far far more expensive? Check (described by one Tory chancellor as a rich man's toy).
But the real kicker? We subsidise them far more than we ever did when they were nationalised.
Privatisation cost us 100,000s of jobs (tbh some rationalisation was needed but entire areas were decimated with no meaningful help forthcoming), billions in lost profit and billions extra passed onto the consumer.
Oh, and now we don't even have the assets.