Originally Posted by Dave Noble

The 1st flight that crosses from 1TC to another TC is the HKG-LHR flight, so BA's allowances will apply

The published BA policy for luggage allowance is 1 x 23 ks ; one extra piece is an entitlement due to OW Emerald status

As such, you will are permitted 2 x 23kg allowance for the journey

Since BA's allowances are applicable, should any of the bags weigh more than 23kg, the overweight cost per bag would be the AUD equivalent of GBP65 ( approx $112 )