Originally Posted by
corporate-wage-slave
In practical terms I suspect this is correct, and though it is possible that Qantas will try and collect a fee at SIN or PER, the reality is that it is unlikely to happen
The reality is also that should BA charge the Qantas excess at check in or should Qantas charge it at Singapore, the excess fees for SIN-PER are $30 per Kg ; 23Kg excess ( if taking 2 x 23Kg = 46 Kg ) could lead to a nice $690 bill at the airport (GBP475)
Seems quite a gamble to risk paying nigh on double the fare ( looking at LHR-PER seems to be GBP450 (fare and fines) plus GBP150 in taxes) and , if it was me, would be inclined to find an airline that flies to Perth whose allowances meet the needs
The OP may be ok and get away with it if BA decides to just check it through from London without charging ( and wouldn't be that surprised if the OP did get away with no additional fees ) but ay least there will be no justification for a rant about being charged the price of the fare in excess fees if does get charged
