Singapore is a mini hub for Qantas with flights from Sydney, Melbourne Perth, Adelaide(some days) and Brisbane all converging in Singapore between about 1930 and 2230. They then connect with the 2 London and the Frankfurt flights that leave before midnight. Likewise in the Europe flights that arrive around 6pm then connect with the outbound flights to Australia.
Sure they could send one one of the A380's via Bangkok instead but then they don't have the capacity SIN-LHR and of course in Bangkok they don't have flights from other cities to combine with on the BKK-LHR leg.
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