Yes as BA Silver (OW Sapphire) on SYD-CNS (domestic terminal) you can enter Qantas Club, and on SYD-SIN (international terminal) you can use the International Business Lounge... one is significantly better than the other! orbitmic, nancypants and Radiation Station like this.

Yes, British Airways Executive Club Silver members can absolutely use Qantas Business Class lounges worldwide in 2026. This is a high-value perk of the oneworld Sapphire tier, which BA Silver status confers. Whether you are at the premier Qantas London Lounge at Heathrow T3 or the flagship lounges in Sydney or Melbourne, you and one guest are entitled to entry as long as you are flying on a oneworld marketed and operated flight. This access provides high-quality amenities, including chef-led dining and shower facilities, which are a "gold-standard" upgrade from the terminal gate. Note that while Silver members get into Business lounges, the Qantas First Class lounges are reserved for BA Gold (oneworld Emerald) members. For 2026 travelers, this cross-airline lounge access is one of the most high-value reasons to maintain Silver status, ensuring a frictionless and luxurious wait between flights across the globe.