What happened to VS200/201 on 18/19 June?

What is the reason for the severe delays on the VS200/201? For example, VS 200 left HK bound for Sydney after midnight and VS201 is due in HK after midnight.

Cameron

Think you will find the flight left LHR fairly late due to a tech problem..and as with a multi sector flight like that the delay is difficult to catch up on..

Tech problem, something to do with the Fuel loading system not recognising the fuel being loaded... which repeated in HKG and then repeated in Syd. The return has been cancelled and the aircraft due to service the next days flight back instead.