Originally Posted by
dilbertsdaddy
Watch out for the huge business class taxes departing LHR/CDG. I don't know if they apply to Virgin and AF but they do on DL. Maybe originating in Germany solves that problem, not sure.
The APD for the UK only applies when departing the UK. It doesn't apply for connecting flights. So if the OP flew FRA-LHR-SEA on one ticket there wouldn't be any additional taxes, but FRA-LHR and LHR-SEA on two tickets there would be additional taxes on the LHR-SEA leg.