I too am a direct descendant of Perry and Louisa through their oldest child William Frederick and subsequently his daughter Olivia. A relative of mine hired someone to research the tree and l have extensive info on all of Perry and Louisa's descendants, however l have nothing pre Australia. Here is a quote from the research notes:
"Louisa passed away at Yorketown and was interned there on July 26th, 1883 aged 77 years.......There is no official registration papers available from the South Australian Registrar of Births, Deaths and Marriages of Perry's death. However, research of an old copy of burial sites held by Yorketown Shire Council shows his grave to be in the Pink Lakes Cemetery, the date thought to be 1891. The site was checked but the grave is unmarked. The cemetery is well cared for by the Lion's Club......Perry also, it appears, had an interest in the mining of salt in the Pink Lakes area, near Yorketown."
I too had found the marriage listing for Perry Wood and Louisa Berry, but l had decided that although the dates were a good match, l couldn't make Millais out of Berry, and also the Wood/Berry children don't all match the Wood/Millais children - the plot thickens.