Which single sold the most copies worldwide Imagine or Mull of Kintyre?

The single "Mull of Kintyre" by Wings, released in 1977, holds the record for the highest sales for a single in the United Kingdom. It sold over 2.5 million copies in the UK alone.

While "Imagine," released by John Lennon in 1971, achieved global popularity and critical acclaim, it didn't surpass the sales record set by "Mull of Kintyre" in terms of total copies sold worldwide.