alt Hacker News> It had approximately 50% of my trips, and frequently only had only one leg of the journey
Relevant current news: Home Office denying child benefits to 1000s of people because they had incomplete data of people vacation trips, so people were thought to have emigrated and never returned [0]. Some people who never even left (due to cancelled flights, denied boardings etc.) were also affected.
[0] https://www.theguardian.com/politics/2025/nov/01/hmrc-likely...
This is because the UK doesn't have exit checks. They rely on airlines to submit the information to them.
I guess this makes sense when you consider that there's an open border with Ireland. Though you'd think that the UK and Ireland could get together to track exits...