Dad would often use this exclamation to attract attention over the general hubbub of conversation before saying something he considered important. Like "shall I bash the spuds?" or "what time's lunch, Pat?" [we're back to food again].
He also went through a phase of saying "morning" repeatedly to every family member he met in an inappropriately formal fashion. I think he picked this up from the round-the-world cruises and cattle conferences.
Pic of the day: Beck and I look like a couple of retards from an austere 60s children's home. Mum again "looking bonny" [another minor Dad-ism, I think].