This paper aims to assess the degree of the income diversification of the UK higher education providers as a component of their overall financial resilience. In addition, we investigate a correlation between ranking, income diversification, and income size. The main research question is whether the higher ranking of the universities, in particular, is associated with higher income and higher diversification relative to lower-ranked universities. To measure income diversification using descriptive statistics, we use Hirschman-Herfindahl Index (HHI), Corrected HHI, and Revenue Diversification Index (RDI). We covered a period of ten years, from 2010/11 to 2019/20. The findings reveal that a higher ranking of the universities measured by both ranking systems has been significantly positively correlated with the size of income and income diversification and negatively correlated with income concentration.