Everywhere seems to have different answers. My tutors are saying faithfully but rob is saying sincerely.
Sincerely if you know the name, faithfully if you don't. https://www.bradleycvs.co.uk/jobsearch/letters.htm
Arcanegirl, When writing a letter and you know the persons name, you would end it with sincerely. Hope this helps. Sincerely, Suz