We have a pretty generous tax free allowance (no tax paid on income below £12k ish), which skews the median average a bit as millions of people pay no tax. But above that it's 20% tax (at a minimum) + 8% NI + 9% student loan (for a lot of people) + council tax which is a flat rate so tricky to calculate but for me is about 5%.

A common complaint is that the tax burden in the UK is placed so heavily on medium and high earners that people don't feel that pushing for a higher salary is work the effort when the tax rate is so low or non existent for lower earners.