Advertised price is from $999 return including taxes, however a quick check with Skyscanner shows that this fare is available from BestJet from $937.72. Dates seem to be readily available from what I have seen. I have flown with Royal Brunei many times to Asia in business class, and this seems like an outstanding deal to London Heathrow for a full service airline.
This promotion has come up a few times (such as https://www.ozbargain.com.au/node/247170) but this is a new sales period.
Main things to note:
• Short stops in Bandar Seri Begawan, Brunei (2.5hr) and in Dubai, UAE (2.5hr)
• Airline does not serve alcohol, although I have heard you may be able to BYO subject to transport safety limits (I don't drink so have never tested this)
TRAVEL PERIODS
27 September to 30 November 2016 and 23 January to 27 March 2017
Awesome deal!