Your "Swedish" source appears to conclude that the wealth tax is effective, but suffered from loopholes and lack of enforcement. Why not fix those rather than follow your "real plan"?
Also your UK link does not support your argument:
> Weaker-than-expected tax liabilities from additional rate taxpayers are not necessarily an indicator of an unexpectedly low yield from the 50p rate. Incomes for those earning above £150,000 could be depressed for other reasons. For example, high income earners are more likely to derive a higher proportion of income from savings, dividends and other investments – and these have been much weaker in recent years than employment income.
Also your UK link does not support your argument:
> Weaker-than-expected tax liabilities from additional rate taxpayers are not necessarily an indicator of an unexpectedly low yield from the 50p rate. Incomes for those earning above £150,000 could be depressed for other reasons. For example, high income earners are more likely to derive a higher proportion of income from savings, dividends and other investments – and these have been much weaker in recent years than employment income.