Dear Mandy,

Good question!

Generally it seems that usage of Yours faithfully/sincerely is becoming far more flexible than the rules that I learned at school allowed....

However, I believe the HK examining board penalises usage such as:
Dear Sir,..Yours sincerely
Dear Mrs Chan,.... Yours faithfully

Therefore, since exams are a matter of life and death in HK, it may be better to be strict with your students and stick to the ancient rules:

Dear Editor,....Yours faithfully
Dear Principal,.....Yours faithfully

I would, however, welcome other people's opinions on this!

Lots of love,

David.

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