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Also, compare the costs of booking trips to other destinations to avoid LHR taxes.
Factor in time, trains, buses, taxes, and value of award ticket to get to a cheaper point, to the $190-$268 (depending on the airline) in UK taxes.
You could break even or just pay a little more for the convenience of flying directly from LHR.
CDG saves me taxes, however, I’d spend $120 trying to avoid $190 in UK taxes & spend more time traveling.