Kind Regards or Kind regards or kind regards...?

Kind regards and best regards can be used interchangeably. To me, 'warm regards' sounds a little strange. Do not use both 'kind regards' and 'yours sincerely' in the same letter - use one or the other.

Written Formula for Ending a Letter (British English)

Informal, personal (to close friends and family):

• With love
• Best wishes

Semi-formal / informal (emails, notes, business memos):

• Kind regards
• Best regards
• Regards

Formal letters:

• Yours sincerely
• • Use when you know the addressee by name (Dear John / Dear Mr Smith). You can only be sincere with someone you know.
• Yours faithfully
• • Use when you don't know the persons name (Dear Sir or Madam).

Case / Capitalisation

Sentence case applies. Only capitalise the first letter of a sentence (with the exception of proper nouns and special conventions).

Punctuation

Open punctuation and mixed punctuation are common in the UK. If you begin the letter with "Dear Jane," (or "Dear Jane:" in American English), then the closing should be punctuated with a comma (e.g. "Kind regards, John"). These commas (or colon and comma in American English) would be omitted when writing a letter in open punctuation (as the line breaks make such punctuation redundant).

Could I finish a note to my grandchildren writing:

kind regards,

Your granddad