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Yep! Thankfully I've found the solution, the issue was the dishing after all... I've trued the wheel properly now it looks way better.
In the meantime I've put two washers onto the hub axle, OLD of the fork was about 74mm while the hub is only 70mm, so now the fork doesn't need to be squished together. 4mm is probably negligible but with such a narrow hub it looked way off. Meh, I'm just nitpicking. The bike looks great, rides great, folds great. Will deffo upgrade the pedals and I've already ordered some bootleg Litepro eazy wheels off AliExpress.
Have you tried loosening both nuts completely, and seeing how it sits in the dropouts then?