Not everyone is doing it, maybe even most aren't, but I feel like HK English has more of the "double <digit>" idiom than other English I've been exposed to.
I don't know where it comes from, if certain schools are teaching it or what. I'm just noting that "double five" has more syllables that "five five" and "one double five eight" at least for me takes more mental effort to receive and understand than "one five five eight".
And that's not even mentioning "double eighteen", what's up with that. 🤣