http://www.boards.ie/vbulletin/showthread.php?p=58788496#post58788496
Just a side bit from this, someone mentioned learning it in school. Did you? I have never heard an Irish person use it, thought it was military only.
We never did, in fact the only time I heard an ounce of it was when on The Bill they would radio in "Sierra Oscar 25147" (and even then I assumed it was Oskah, not Oscar, given the London accent, thought it was some type of codeword

). The first time I ever heard it in real life was working in a call centre, some English guy started spelling out his email address "charliealphatango....." I type fairly fast so I typed out the entire words

Quite a few of the English use it but I always assumed they were ex-services or whatever.