Originally Posted by
danam
There's a gate passport/ID check leaving London. Different details should have been spotted if they traveled with their own passport/ID. So does this mean they also used a forged document, just for a one way to Zurich?
Edit: as c-w-s mentions, it can be a bit lax, but still a big risk.
Out of London going to Europe, no one really checks if you have the correct passport, just a passport.