I think some of you have forgotten - or indeed you may not know - but the BOM model is built on the UKMO base platform, ie: it's essentially the same model, with slight variation to account for SH and, specifically, the Australasian region.
The UKMO sells its forecasting services to foreign meteorology agencies - one of its main revenue generators. So, if you want to extrapolate forward beyond the 144h range of the NH UKMO, take a view from the BOM. However, caveat that with the understanding that each model does have regional tweaking.