Originally Posted by
zkzkz
This is exactly what's done pretty much everywhere around the world. From the international departures area after exit passport control if applicable or where duty free is sold there's always a door that leads to immigration and customs with a security guard making sure nobody goes the wrong direction.
Could you give us some examples? I can't immediately think of any in my usual airports. Outside the UK, I hasten to add.
The only place that I regularly go to that has something nearly so simple is SYD T1, where you go back to transfer security and ask the security people nicely if they will let you reverse back into the arrivals stream.
I can also immediately think of one part of LHR where it couldn't be this simple, not least because (inbound) immigration and customs is in a different building from (outbound) security and duty-free.