Rumor: Apple to drop headphones and charger from iPhone 12 box
imore.com
imore.com
Given the increasingly small number of different cables, I'd be fine with buying my own every few years.
The folding uk plug, it was under all the other stuff, I think you may have been throwing it away https://store.apple.com/uk/xc/product/MGRL2B/A
If there wasn't, I would've immediately reported it is damaged goods.