In 2026, the best-supported estimate is that the UK has around 3 million adult millionaires —roughly “just over three million” according to 2024 wealth data that is being used as the current benchmark in 2026 reporting.

Quick Scoop

The most directly relevant figure I found says that over three million adults in the UK had assets worth at least $1 million (£779,145) or more, based on UBS’s 2024 Global Wealth Report.

A separate 2026 write-up also points to the UK having more than 3 million millionaires , but it does not present a clearer official count than that benchmark.

What that means

  • Best estimate: a little above 3,000,000 millionaire adults.
  • Why it matters: wealth estimates move with asset prices, currency changes, and how “millionaire” is defined.
  • Caution: some articles discuss “millionaires” without saying whether they mean adults only, households, or a different currency threshold.

Simple answer

If you want the shortest possible answer: about 3 million millionaire adults live in the UK in 2026.

Source note

The cleanest available figure here comes from UBS-based reporting; more recent articles discuss the topic but do not replace that number with a clearly better official 2026 count.