Hi,
I am not sure about Ian Aubrey born 1933

Depending on the findings on the INWOOD marriage certificate, you may have to explore the possibility that Annie and Lillian are one in the same person after all.
Annie WALKER wished to travel to NZ and ,as both her (KENYON) boys, Bruce and William, were NZ born , this was before 1923 or 24.
Her divorce had not come through and William KENYON's wife, Catherine, was still alive.
Perhaps a quick change of first name for the duration of the "waiting period" was a convenient solution which might offer a little cover. This was dropped the moment the news of Catherine's death came through.
The travelling back and forth to NSW then makes sense and one of these trips, as noted , seems to be with her daughter. The shipping record shows "Mrs Kenyon born in Aust" which of course, Annie was as HUNT.
Anyhow, just thoughts.
Sue