I think it varies but I myself use the "twenty-five minutes to six" form, although in actual conversation (say a stranger asking the time) it goes something more like :
"Alright mate, got the time?"
"Twenty-five to."
"Six?"
"Yeah."
"Cheers"
We don't really say "minutes" as that's a bit formal, it does mean we round up a bit, it's always "quarter to six" rather than fifteen or fourteen or thirteen.
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