Hi Yours faithfully (or faithfully yours) seem too informal to me. If you really want to impress them, I'd recommend: I have the honour to remain, Sir, with the greatest respect, or if it's a woman: I have the honour to remain, Madam, with the greatest respect, There are probably multiple variants on this one. Regards Dokterjokkebrok
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.