Home favourite Georgia Hall shot a near-perfect five under par final round to claim the Women's British Open title.
Roared on under blue skies by the large gallery desperate for a home victor, the 39th-ranked Hall started the day a shot behind Pornanong, who led after the second and third rounds.
Faldo's famous win in Georgia inspired her name.
Twenty-two years later, Hall is the pride of English golf just like Faldo was.
She represented Europe at the Junior Solheim Cup in Colorado in 2013, and a year later she lined up alongside Bronte Law and Steph Meadow in the Great Britain and Ireland team at the Curtis Cup.
Lydia Ko remains in the top 10 after three rounds of the women's British Open at Royal Lytham and St Annes. A thrilling contest was then effectively decided on the 17th where Phatlum found sand off the tee and compounded the error by three-putting for a double bogey, leaving Hall with a three-shot lead that not even a bogey on the last could erase.
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While first-round leader Minjee Lee and encountered problems down the stretch at a rainy Royal Lytham to give up two-shot leads on Friday, Pornanong played a steady hand and put her pink ball in all the right places - explicitly, out of the many bunkers that define the course.
Phatlum, the third-round leader, came out strong with four birdies over the first six holes.
Pornanong has missed six cuts from seven previous appearances in the championship and her best result in a major is a tie for seventh in the 2014 US Women's Open. It was very close up until the final two holes, so I was just trying to hole the putts.
Roared on by the large galleries in her home country, the 22-year-old Hall only took the lead for the first time after a 20-foot putt for birdie at the 16th hole and stayed steady to post 5-under 67.
Phatlum was her nearest challenger, with Korean Ryu So-yeon third another two shots adrift.
Georgia Hall on Sunday became the fourth Englishwoman major champion when she carded a closing five-under-par 67 to clinch victory at the Women's British Open in Lancashire, England.
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It started from the outset, with Hall instantly applying pressure thanks to a fine clutch putt to make birdie at the first and take a share of the lead.
She followed Stupples and Catriona Matthew - in 2009 at Lytham - as the only British winners of the Women's British Open since it achieved major status in 2001. "I was so happy".
She birdied the third, sixth, eighth, and 11th holes, and dropped her first shot of the major on the par-3 12th, a bogey.
She said: "I saw so many little girls come out, three or four-year-olds just wanting a picture with me".
Phatlum, who had started the day with a shot advantage, eventually fell short after a costly double-bogey on the pair's 71st hole of the tournament.
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