Additional weight when taking a bike with Air Brunei

I am flying to Melbourne with Air Brunei from London. I have heard that they increase your base allowance (30kg) when you travel with a bike (by approx 8-15kg).

I can't though find any documentation on their website about this and only have anecdotal evidence (from blogs and an instance from some friends).

Some airlines like royal brunei and Malaysia will include a bicycle in your 30 kilo check in weight, acually, when you tell them you have bicycle i think they throw 15kilo in for free….But it depends on the airline..and as I’ve said in another comment, people should contact it, read the oversized luggage policy

Does anyone know the bike luggage allowances for Air Brunei (for a standard ticket) and whether these need to be booked in advance?