This isn't rocket science, it's simply a total rejection of socialism, marxism and post modernism which are a cancer that eat away at the soft under belly of our nation.
You are right in a way: as long as they can still get access to the quality of labour and the services they need, companies would flock here if taxes were lower than everywhere else. It would be a paradise for corporations and the better off.
However, if the welfare state was dismantled, where is the safety net if someone loses their job? Where does the care for the disabled, elderly, and most vulnerable come from? With lower tax receipts, how will the government fund the armed services, the emergency services, and the NHS? Bin collections? Road networks?
And when these all suffer, how will the corporations feel about having to pay higher wages to fund private insurances? Where law and order is breaking down? Where garbage piles up in the streets? Where their employees end up ill because they can't afford to see a doctor? Where the roads are crumbling (even more than now) and wagons can't get where they need to go (or where they have to pay extra to use private toll roads)?
You are also assuming that we would get a tariff free trade deal with the EU and the US, which are definitely not guaranteed.