No show and cancellation of return

[Gordon17]

Thanks for replying.
It was a single multi-leg booking made on Ba.com. It was booked through BA and partly paid for with Avios points. Heathrow to Sydney on Qatar (BA Code Share) then Brisbane to Heathrow with Qantas and BA 4 weeks later.
So it's a BA booking and it still shows all 3 of us as being on the return flights.