Agreed
But rules of grammar I was taught was that if you start letter with Dear Mr Brown then you end with yours sincerely and if you start with Dear sir / madam then you end with yours faithfully
Hope I remembered it the right way round because almost all of my communication is by email where ending is either Regards or Best Regards
I was always told it was "Yours sincerely" for formal or business related so consequently been doing that for many years. Haven`t had a visit from the grammar police yet.
The grammar police may not visit but when they are also potential employers they may make a judgement but not give an explanation so I wouldn't advise people to depart too much from the accepted rules in some situations. In the case of sincerely/faithfully, however, I doubt that on its own it is a deal breaker but wouldn't take the risk in a job application. For a letter to the bank/HMRC/council then it makes no difference whatsover.
Tony, when I started my banking career in the early 1960's, we were taught the Dear Sir / Yours faithfully or Dear Mr(s) / Yours sincerely rule, although one of the senior managers would still use the salutation I originally quoted but not always with the "humble" part.
We were also taught the as a bank we had "customers", there were only 2 professions the had "clients" and they were both solicitors (but on other sides of the law).