In Capitalisation^x, Commas^x

Written Formula for Ending a Letter (British English)Informal, personal (to close friends and family):With loveBest wishesSemi-formal / informal (emails, notes, business memos):Kind regardsBest regardsRegardsFormal letters:Yours sincerelyUse when you know the addressee by name (Dear John / Dear...

I've come across this before somewhere. I may have got this wrong, but I seem to recall reading that US usage prefers a comma in cases like this, and UK usage doesn't. This accords with my (BrE) view that commas are unnecessary, but not yours apparently. I have no problem with the...

3. All coloured stone earrings list as listed at RM 88 or RM 98. 4. Some other colour stones series - buy one free two. Some other coloured stone products -- buy one, get two free.

From "A Grammar of Contemporary English", by R. Quirk et al. Both question and exclamation mark exclude the use of other separation punctuation and have the value of a period inasmuch as what follows begins with the capitalisation of a new sentence. But when they co-ocur with the end of...