oUR001 -I presume the 66% restriction is only applicable on the SYD-HKG leg as VS have no such restriction on SYD-LHR.
VS has always struggled with SYD-HKG as they could always fill the plane HKG-LHR so the SYD-LHR pax were few and far between, thus relying on the SYd-HKG sector. SYd-HKG has been quite cheap for the punters, but SYD-LHR is VERY expensive.
I expect the capacity issue to be resolved form Christmas as they are introducing a second LHR-HKG service which will mean more SYD-LHR pax can jump on the VS200/201 service now....