Originally Posted by
woobl
Thanks for the info and all understood. Regarding the return, does CX’s policy allow for interlining the other way? I.e. coming back from CDG to LHR on a separate ticket?
Yes CX does through-check separate oneworld tickets

The other oneworld carriers that offer this are AS, QR, JL, MH and UL.
(In specific scenarios QF and AY will also)
Look under the “Transfer Baggage” section for written confirmation of CX’s policy (keep this link handy in case you get any initial resistance from a potentially outsourced agent at SYD):
https://www.cathaypacific.com/cx/en_US/baggage.html