Good morning, Roger!
I have spent a while on the phone to various companies and it looks
like the cheapest and most flexible option will be to use Just The
Ticket [ http://www.justtheticket.co.uk ] after all.
They quoted me a price of £1182 with £75.80 tax for a Business Class
flight which meets your requirements with the following example
Airline: Cathay Pacific
Depart: London Heathrow (Terminal 3) at 18:25 on the 10th June.
Arrive: Hong Kong at 13:20 (11th).
Depart: Hong Kong at 23:20 (13th).
Arrive: Cairns at 13:50 (15th).
You will be able to stay in Hong Kong as long as you like and if you
wish to travel to Thailand, I also obtained details for a return trip
Hong Kong to Bangkok which is a separate flight from the one above.
The price for this flight is £627 with £6.30 tax, making a grand total
of £1891.10 for the entire trip.
To put the prices into perspective, Lastminute.com [
http://www.lastminute.com ] quoted a price of £1515 for a similar
timetable to the one above.
I have no idea why they are so different because they use the same
Just The Ticket accept telephone (+44 020 7291 8111) as well as
internet reservations and the person I spoke to was very helpful.
For your information, these are the details for Cathay Pacific:
Terminal 3 Departures,
Tel: +44(20) 8834-8888
Fax: +44(20) 8741-5477
Heathrow Airport (Flight Enquiries):
Tel: +44(20) 8897-9335
Following up on information from Clouseau, I also spoke to a
representative from Travelbag [ http://www.travelbag.co.uk ] who gave
me more information regarding the (return) fares with Thai Airlines.
I do not have the flight times but the schedule would look like this:
London > Bangkok > Hong Kong > Bangkok > Sydney or Brisbane > Cairns
This return fare would have a total price of £2860 including all taxes
and local flights.
One slight disadvantage is that the Bangkok to Hong Kong flight is
Economy Class only.
If you are interested in the above flight you can contact the rep,
Piers Morgan, at the email address: firstname.lastname@example.org quoting
the reference WEB41823.
If you wish, you can telephone them when in the UK on 0870 9020150.
Travelbag can offer a "Round the world" fare which will take you to
all of these destinations and even take you to Los Angeles or back to
London for a cost of approximately £3270.
However, these tickets must be issued a minimum of two weeks before
departure making this unsuitable for your needs.
I hope this helps you!
I will also clarify the previous Heathrow hotel question now that I
know the airport terminal information.