Hello Francis
Had a quick look again at the marriage of Robert Moore and Catharine Sharpe , in Arbory 25/1/1845. You can now view the wording , which was not available when I was researching. The amazing thing is that one witness was William Qualtrough . My wife's grandfather Edward Bruce Clucas has a W Q in his line , ch 25/3/1825 Arbory , born at Ballachrink, Colby Glen, Arbory.
So very possible it was him.
Edward Bruce Clucas and Annie May Pickard married in Sydney NSW in 1916.
David