Of the 170,000 people who go missing in the UK each year, some cases remain etched in our minds, while others fade too quickly from public attention, if they were ever known at all.

In its annual report, the research group UFO Identified documented 395 sightings in the UK in 2023 - a 20% drop from 497 sightings in 2022 and lower than in 2021 (413) and 2020 (484). That adds up ...