This marriage year is a guesstimate. The following years after Nov 1945 military discharge, and birth of first son in 1947. Harold's sister's Pauline and Margaret both alive at time of writing this. Both agree most likely to be married at Adelaide Registry Office as they recall them announcing. Son Robin confirmed to me on text message on 26 Nov 2018, Adelaide Registry Office. He also confirmed her name is Melva Ann Cornitha by providing his birth certificate with her full name on it. Robin advised by text that Bonny was a nickname all on text message dated 2 Dec2018.
This marriage year is a correct guesstimate because it is written on son Robin Lindsay Clarke birth certificate.
[S-165] FS Pauline Clarke re Clarke and Appelt families, 15 Nov 2018 Researcher Lorna Mclean.
Telephone call to Pauline Dec 2018 sister to Harold Clarke and lived amoung these people offered me details, in notes in private until further evidence.
This circa (about) 1946 is because Harold was discharged Nov 1945 and first child born 1947. She remembers Harold (her brother) arriving (no date recall) with Melva (Bonney) announcing "we're married!" Harry's style she said as his flamboyant nature apparently was back in those early days.