ive never had to sing the national anthem in my life. >_>; 
I only know it because i watch Rugby.
We do it on the national day and during graduations 
Royal weddings too
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    1
    Thou ancient, Thou free, Thou mountainous north
    Thou quiet, Thou joyful [and] fair!
    I greet thee, loveliest land upon earth,
    /:Thy sun, Thy sky, Thy climes green.:/
    2
    Thou thronest on memories of great olden days,
    When honoured Thy name flew across the earth,
    I know that Thou art and wilt remain what thou werest,
    /:Yes, I want to live, I want to die in the North.:/