This is indexed in "NZ Passenger Lists" but appears to be outgoing from Wellington to Sydney:
https://familysearch.org/pal:/MM9.1.1/KGMM-Q3KThe SS Ulimaroa, left for Sydney 31st October 1930.
On board, Mr J Lyon, 28, marine engineer, and Mrs C Lyon, 28, both born England, travelling 1st class.
They presumably then went on from Sydney to England, but I don't have access to UK incoming passenger lists.