My wife was thinking of travelling through LTN on her way until we found out that there's apparently no airside transit area in LTN and you need to pass through border control, so even if you catch another flight without ever leaving the airport, you need a transit visa (if you're not a EU citizen or some other exception).
It made me wonder - if the airport has no transit area, what will they do with you if you show up without a transit visa? Has anyone had that happen to them? From what I understand about the airport, they'll anyway have to bring you from arrivals to departure if they want to send you away again.
Or is there an airside transit and you just need to exit if you need to check in to your next flight (which these days you can do online if you have no luggage) ?