Attendees of Gwyneth Paltrow’s UK wellness summit in London are revolting after they were charged $5,700 to attend — then subjected to a weekend-long Goop sales pitch, while the actress skipped out on some of the festivities.

One attendee told us that a prominent British guest was so appalled by the aggressive Goop hype that she sent a WhatsApp message to fellow attendees saying, “GP [what the Goop community calls Paltrow] is a f - - king extortionist.”

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Those at the event this weekend were urged to book rooms through Goop at $1,300 for two nights at the Kimpton Fitzroy London Hotel, but some later discovered that rates that weekend started at $250 a night. (The Goop rooms were suites with a gluten-free breakfast included.)

The event featured a “health summit” where Gwyneth — who was surrounded by security — offered helpful tips such as “creativity with your hands is like channeling God,” how to “hydrate mindfully” along with a sound bath, and a workout with her trainer Tracy Anderson.

An on-site Goop store offered fare like a $55 vibrator named the Millionaire (because it “Feels like a million bucks”).

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One attendee told us, “Gwyneth acts like she’s a health goddess, but actually she’s a pretentious, greedy extortionist. She had a ton of security . . . She was unapproachable. She did the minimum — a few fireside chats with Twiggy and Penelope Cruz, then she put on her Birkenstocks and snuck out . . . I was a huge fan of Gwyneth; now I feel like I have lost my faith in God.”

A Goop rep said the true value of the weekend was over $8,000 because of free extras including golden facials and “far-infrared gemstone therapy” as well as health panels not connected to Goop.

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As for Gwyneth: “In addition to walking around the summit, she also hosted an intimate workout class with Tracy . . . followed by . . . a panel, where she and Tracy answered attendee questions in an honest, casual setting . . . We have not received negative feedback . . . [It] was more along the lines of, ‘Thanks for an amazing weekend!’ ”

This article originally appeared in Page Six.