Originally Posted by
windowontheAside
It means that if you leave the airport for your stopover instead of just passing through on a connection, BA will have to pay HMRC £170 more APD.
So they pass it along to you.
Not quite. If you stop over for more than 24 hours, then the APD kicks in. You're entitled to leave the airport and even sleep overnight. I am doing exactly this in a few months.