1) Is it acceptable to put a hyphen after a "h" which is prefixed to a vowel?

I myself always write "X na háite", but I've seen people use a hyphen. I find the hyphen unattractive (but that's possibly because I'm so used to not using it myself).

2) Is it acceptable to put a hyphen after an urú?

I never do, except when I'm prefixing "n" to a lowercase vowel, e.g.:

ar an mballa
leis an bhfear
i measc na n-ainmhithe (ach "na nAinmhithe")

3) Should you capitalise both the prefix and the noun?

Let's say we have a book called "Life of the Great Fighter", would we call it:

a) Saol an Ard-Trodaí (I think this one's right)
b) Saol an Ard-trodaí
c) Saol an ArdTrodaí

or, "Life of the Great Teacher":

a) Saol an Ard-Mhúinteora (I think this one's right)
b) Saol an Ard-mhúinteora
c) Saol an ArdMhúinteora

Is there a tendancy to remove hyphens when there's capitalisation (e.g. An tAthair) or is this simply limited to prefixing "t" to a masculine noun, or prefixing an urú to an uppercase vowel (na nAinmhithe).

4) Is it acceptable to use a hyphen after a "t" prefixed to an "s"?

I always write: "an tsráid", "X an tsiúcra".

Do some people write "an t-sráid"?



Any other technicalities that anyone can think of?

A hyphen is used:

between the prefixes n and t and a vowel which is not a capital letter. A hyphen is never inserted after the prefix h

3a is correct.

4. No.