CX lounge access without status but BA Business class ticket
 

Flying out of T3, with a BA Business class ticket and no status. Can I access the CX lounge?

Yes you can

Generally a OW J ticket will allow access to all OW J lounges, a F ticket to all F lounges. Exceptions are "special" lounges such as the Concorde Room, third party lounges, flights operated by some non OW partners, lounges in different security zones (such as other terminals), capacity, and whatever other special cases airlines have come up with over the years...

Also, isn't the OP lifetime gold? ;)

You must be thinking of SUPER Mario. :D

OP got me thinking - do you get access to CX's lounge if you're flying CE out of T3? Or do you have to be in CW (I know BA J to anywhere grants BA lounge access)

Any* Oneworld business class ticket will get you into any* Oneworld business lounge, so no problem getting into the T3 CX lounge with a CE ticket.

*I'm sure there are a bunch of caveats that I haven't thought of, e.g. AA domestic J

You can gain access from a CE ticket

Yeah, AA flyer here that suffers through lack of lounge access on domestic J tickets