I am flying from USA to London England, then to Belfast Northern Ireland. My flight back to USA departs from Dublin, so to catch my flight I will cross the land border between Northern Ireland (UK) and Republic of Ireland, which is uncontrolled.
Like USA, I assume UK has records of people leaving via plane to track overstays, even if there is no physical exit control. Will my itinerary cause a problem with UK immigration because they have no record of how I left the country?
(my citizenship is USA)