At a quick look they've hit you for the full whack of fuel taxes (the YQ+YR is 70% of the total taxes). The UK taxes are GB and UB and look about right. YR is the CX surcharges (US$59.70 long haul, $14.50 for short). YQ is (I think) the AA surcharges mandated in the fare rules (possibly the BA ones as well).