Thumbsucker Harry:
So the original source is Tiggy Legge Bourke, mentioned in passing in a book by a true Diana Stan Christopher P. Andersen, former People editor and bestseller writer, the books name is " After Diana:William, Harry, Charles, and the royal house of Windsor."
Piers Morgan and the 5 Hertford Street date description, the original was on DM, it also contained the texts Peg sent him like :"I'm a fan of you" and "Love you. "
Here is confirmation of their date:
The king of London’s nightlife scene is finally headed to New York. Robin Birley — whose posh, members-only club 5 Hertford Street is where Prince Harry and Meghan Markle had their first date — is …
nypost.com