The Daily Mail reports that the number of millionaires in Britain has fallen to its lowest level in 20 years, according to the headline of this article. However, the full body text of the piece was not included in the material provided, so the specific findings, data source and expert commentary behind the claim cannot be verified or summarised in detail here.

Based on the title alone, the story appears to concern a notable decline in the UK's millionaire population over a two-decade period, a trend that would typically be linked to factors such as taxation, cost of living, wealth migration or economic conditions. Without the article's full text, including the underlying statistics, the organisation or study cited, and any accompanying analysis, a fuller account cannot be given.