Last year, I had a last-in-first-out connection from Europe where I had to overnight in London. I was able to convince the AAgent to waive the 20GBP.

Soon, I have an open-jaw. Into Europe, out of London, separate one-way ticket for Europe-UK. Total time in London is < 24 hours. I wonder if I can avoid the 20GBP by showing the one-way ticket from Europe?