An investment income surcharge in the Uk could raise up to £18 billion of extra tax revenue a year for the UK https://www.taxresearch.org.uk/Blog/2023/09/13/an-investment-income-surcharge-in-the-uk-could-raise-up-to-18-billion-of-extra-tax-revenue-a-year-for-the-uk/. There is no national insurance on rents, capital gains and savings-based income. Those with high levels of this income should pay more tax to compensate.
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In my view, NI should be levied on ALL personal income via the income tax system, whatever the source, with the possible exception of pensions below a certain level.
