When you say "taxpayers like you and me" bought the nationalised companies, you mean taxpayers (investors) like you bought them while taxpayers like me who thought we already owned them had them sold off at less than market value (i.e. stolen). "Selling the family silver", as former Tory PM Macmillan called it.
The state received lots of money for the sale of the former nationalised industries. Where did you think all that money went? Geoffrey Howe's Swiss bank account and his £540m yacht? He doesn't have one.
It went on public spending. The government had more money than it otherwise would have had, were these industries not sold off. Had they not been sold off, then the government(s) would not have had this money and therefore either public spending would have had to be cut, or taxes raised. The sales of nationalised assets, brought benefits to ordinary citizens like you and me, and these benefits have been paid for by investors.
Now we can reverse that if you like? Take money off the likes of you and me, in order to fund the government sufficiently to buy the assets back again. The government can either do that directly by increasing your income tax for a period of years, or by issuing debt and then taxing you more over time.
And for what exactly? Why on earth would anyone want to take money off people simply to return privatised businesses into state ownership? It's utter madness, driven by Marxist ideology and nothing more than that. The ludicrous misconception that "the state knows best". That government knows how to make cars better than BMW does. That government knows how to do broadband better than BT does. That government knows how to run trains better than First Group does.
It's madness. Government cannot run a piss up in a brewery, so what on earth makes anyone think they can run nationalised industries better?
Do you remember the state of British Leyland? How utterly shit the trains were before privatisation? How long it took the GPO to install a phone line? These industries were fucking awful under state ownership.
Look at the water industry by comparison now. Bills (in real terms) are down, leaks are down, beaches are cleaner, investment is at record levels. Seeking to nationalise this again - at great cost to the taxpayer - is fucking bonkers and there can be no other words for it. Marxist, ideological bullshit.