Who's NOTW?
I'd also expect they DNA test all children born.
Also, I think the Windsors would love to stick it to Diana, especially after they split up and the divorce. They wouldn't have tolerated a cuckoo child and used anything during divorce proceedings to minimize payout and dent her popularity (show her as homewrecker, who bore another man's child) etc.
Yeah Liz the queen mum allegedly only ever had time for heirs, i.e. Charles and William. William was showered with attention and invites, Harry not so much.
The old crone was far from the "nice old granny", which her image was built on. There's a number of good docus on her on YouTube, if anyone's interested. One's called "I'm not as nice as people think I am". She was cold, calculated, shrewed, mean.