From Longman Dictionary of Contemporary EnglishYours faithfullyYours faithfullyBritish EnglishTCM the usual polite way of ending a formal letter, which you have begun with Dear Sir or Dear Madam → faithfully
Examples from the Corpus
Yours faithfully• Your faithfully, Adam Browning• Such letters will close with Yours faithfully.• Thanks also to anyone else involved who may read this letter. Yours faithfully.• So what is new? Yours faithfully, Heinz Vuillermoz.Yours faithfullyYours faithfullyBritish EnglishTCM used to end a formal letter that begins ‘Dear Sir’ or ‘Dear Madam’ → yoursExamples from the Corpus
Yours faithfully• Such letters will close with Yours faithfully.• Thanks also to anyone else involved who may read this letter. Yours faithfully.• So what is new? Yours faithfully, Heinz Vuillermoz. 