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It's on my 2015 6 speed model. Nothing screwed in though, as the boss is only meant to have something there with mudguard-less models, as then the brake cable can interfere with the wheel or something like that.
Here's the modern version of the part that would fit there. I don't remember it being a disc like this. https://www.condorcycles.com/products/brompton-cable-fender-disc?variant=42321712074
EDIT: okay found a pic...
Ah yeah sorry.
Don’t think I’ve had a fork with that boss on then? Has it always been there?