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You need the 2nut, the grippy is too tall, I got some on order for sjs last week, about 2-3 weeks away as saddleback don’t stock them...
Can just use a Joseph kuosac otherwise, sealed bearing and £20
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i had ck headset on my brompton, but with gripnut, the steerer was coming loose after a while being tightened, go with 2nut as someone mentioned. Got mine at AVT.bike. https://www.avt.bike/chris-king-convert-to-1-18-inch-2nut.html
What CK headset do I need for a brompton?