Two unsuitable for delicately-minded maiden ladies, sorry.
I used to like this one of my father’s - falling over was ‘going arse over breakfast time’. Never heard it from anyone else though.
Nor his expression for being scared witless - ‘shitting little blue lights’ - DBro and I were wondering just the other day whether it was his own invention, since we’ve never heard it anywhere else.
My DF had what would still be considered a ‘posh’ voice but his language was very often ‘colourful’. My DM always put it down to his WW2 years in the RN, since we never heard so much as a ‘colourful’ word from his parents.