I am considering booking the flights below and read some talk about big tax differences on routes that are similar to one another - can someone check if the tax on this looks right and if there is anyway to reduce any of it? thanks

Travellers Fare Taxes (beakdown at bottom of page)
1 Adult(s) x (1,549.00 + 365.60) = 1,914.60 GBP

Monday 19 January 2009
Departure: 20:50 London, United Kingdom - Heathrow
Arrival: 10:25 +1 day(s) Delhi, India - Indira Gandhi International
Airline: British Airways BA257 E

Mumbai (Bombay) to Bangkok
Monday 2 March 2009
Departure: 05:20 Mumbai (Bombay), India - Chhatrapati Shivaji
Arrival: 10:45 Bangkok, Thailand - Suvarnabhumi International
Airline: Cathay Pacific CX750 E

Bangkok to Sydney
Sunday 10 May 2009
Departure: 18:10 Bangkok, Thailand - Suvarnabhumi International
Arrival: 06:05 +1 day(s) Sydney, Australia - Kingsford Smith
Airline: British Airways BA9 E

Sydney to Melbourne
Sunday 21 June 2009
Departure: 12:00 Sydney, Australia - Kingsford Smith
Arrival: 13:30 Melbourne, Australia - Tullamarine
Airline: Qantas Airways QF431 E

Melbourne to Perth
Sunday 5 July 2009
Departure: 10:45 Melbourne, Australia - Tullamarine
Arrival: 12:55 Perth, Australia - Perth
Airline: Qantas Airways QF475 E

Perth to Darwin
Sunday 19 July 2009
Departure: 08:20 Perth, Australia - Perth
Arrival: 13:15 Darwin, Australia - Darwin
Airline: Qantas Airways QF792 E

Darwin to Cairns
Sunday 9 August 2009
Departure: 07:00 Darwin, Australia - Darwin
Arrival: 09:55 Cairns, Australia - Cairns
Airline: Qantas Airways QF1871 E


Sydney to Santiago
Saturday 19 September 2009
Departure: 10:55 Sydney, Australia - Kingsford Smith
Arrival: 13:05 Santiago, Chile - Arturo Merino Benitez
Airline: LAN Airlines LA800 E

Santiago to Easter Island
Sunday 20 September 2009
Departure: 08:10 Santiago, Chile - Arturo Merino Benitez
Arrival: 11:50 Easter Island, Chile - Mataveri International
Airline: LAN Airlines LA841 E

Easter Island to Santiago
Thursday 24 September 2009
Departure: 10:45 Easter Island, Chile - Mataveri International
Arrival: 17:25 Santiago, Chile - Arturo Merino Benitez
Airline: LAN Airlines LA834 E

Santiago to Quito
Friday 25 September 2009
Departure: 15:05 Santiago, Chile - Arturo Merino Benitez
Arrival: 20:55 Quito, Ecuador - Mariscal Sucr
Airline: LAN Airlines LA1446 E

Quito to Lima
Friday 9 October 2009
Departure: 09:10 Quito, Ecuador - Mariscal Sucr
Arrival: 11:25 Lima, Peru - J Chavez International
Airline: LAN Airlines LA2589 E

Buenos Aires to London
Tuesday 22 December 2009
Departure: 14:15 Buenos Aires, Argentina - Pistarini
Arrival: 07:15 +1 day(s) London, United Kingdom - Heathrow
Airline: British Airways BA246 E

Travellers Fare Taxes
1 Adult(s) x (1,549.00 + 365.60) = 1,914.60 GBP

Adult traveller(s)
Airline Fuel Surcharge 137.00 GBP
Tax description unavailable (YRVB) 0.80 GBP
Tax description unavailable (QODP) 6.90 GBP
Tax description unavailable (CLLO) 12.60 GBP
Tax description unavailable (ZQAD) 20.70 GBP
Tax description unavailable (WTSE) 2.10 GBP
Airline Insurance Surcharge 7.50 GBP
Thailand Passenger Service Charge 13.90 GBP
Tax description unavailable (WOMU) 4.00 GBP
Tax description unavailable (DYAE) 10.30 GBP
Multiple Surcharges 9.50 GBP
Australian Passenger Service Charge 23.60 GBP
Tax description unavailable (TQSE) 1.70 GBP
Tax description unavailable (QREB) 14.00 GBP
UK Air Passenger Duty 40.00 GBP
Tax description unavailable (WGSE) 6.00 GBP
UK Passenger Service Charge 19.70 GBP
Tax description unavailable (QRCO) 12.40 GBP
Australia Passenger Movement Charge 22.90 GBP
365.60 GBP
x 1 Adult(s) = 365.60 GBP

total taxes/surcharges = 365.60 GBP