[quote:14mwszvz]"BH" = "V" in Irish! [/quote:14mwszvz]
As I'm always up for a bit of a ding dong on the subject of language...
BH = V and PH = F both have a certain logic to them. B is a bilabial voiced stop and P a bilabial voiceless stop. Adding an H to them apparently changes them to labiodental voiced and voiceless fricatives, respectively V and F. English and Gaelic follow the same pattern in this.
It's BH = W that's an aberration. What's with that?