i agree with most of MMI's comments and have some minor suggestions - please ignore if not helpful:

"I am lord Daniel Coyle, I have in the past: played Polo with heirs to the throne, rubbed shoulders with the highest class of people, and entertained dignitaries and diplomats."

i suggest replacing the first comma, either with a semi-colon or a full stop.

..
"Yet I find myself on the cusp of losing all I have, and the respect of my peers with it."

i dislike "with it" and dislike "withal" still more. i also question the sense of the sentence, as surely the respect is included in "all i have"... unless made clear that the latter means material possessions. probably just a style preference. i'd agree it's improved just by removing "with it".
...
"The cost of keeping my wife Julia and I in the manner that we expect, has been a steady drain on our finances: the summers in the south of France, the winters skiing in Klosters and our membership to the club."

1. should be "and me" not "and i"
2. suggest colon become semi-colon
3. suggest "to the club" become "of the club"
...

"The biggest losses have come from my own mistakes though I was cheated out of millions by a underhanded and deceitful business partner, but my worst loss by far was the divorce settlement to my first wife Laura."

suggest the comma and "but" be replaced by a semi-colon.
suggest "have come from" be replaced by "arose from".
suggest adding a comma before "though".
suggest adding "single" before "worst".

hope that helps

angela