During Covid the wealth of millionaires and billionaires also increased exponentially and the gap increased as they hoovered up assets as people suffered. It needs sorting before they spend it all on weapons and buying the media and politics.
Nonetheless. You could tax every billionaire to the hilt, and end up paying maybe three years of debt interest. The UK has overspent for about twenty five years now. It cannot tax or borrow it's way out of it. It can't be done