I'm not suggesting a 90% tax rate. We are not France; we don't have "supertax" - our highest rate of tax is 45% on people earning above, I think, £150,000 p.a. That is the absolute maximum that will be paid, even if someone has an income of millions of pounds a year. Nevertheless, however wealthy, some of them just don't want to pay.
In the publication Management Today in 2012 it was reported that 1 in 10 high earners pay too little tax. 6% of £10million+ earners paid less than 10% in tax, while another 3% paid less than 20%. Just over 20% paid more than 40% in income tax.
Our income tax is certainly not that low compared to some other countries such as the US. However, it is a lot lower than in Scandinavia which is well known for a high taxation system and consequently a much more equitable distribution of wealth, together with excellent childcare, education, care for the elderly and healthcare provision.
An article on the US News - Economic Intelligence - website states that
high taxation does not affect Scandinavian work motivation and productivity. Denmark in particular has a "clean and transparent" tax system, without many loopholes and deductions. This keeps people from sheltering their income.