Hi Leigh,
Re, my previous comment....
"You can purchase his (William TITLEY) parents, George and Agnes, marriage certificate, from the NZ BDM website.
1858/1299 Agnes Farrell George Titley Order Product "
I forgot to give you the website to purchase this marriage certificate, from New Zealand. Here it is.
https://www.bdmhistoricalrecords.dia.govt.nz/search/Mary