Got all the groups, but not the swift connection. Too old/cultured/uninterested, I guess.

But the chocolate group isn't really internally consistent. Three of them are indeed bars, two of them are manufacturers. The UK link is correct only if you allow one manufacturer together with three bars. Could have made more of it.

Agreed. Yorkie and Aero are chocolate bars made by Nestlé. Cadbury and Mars are manufacturers, although Mars is also the name of the chocolate bar. A bit too complicated to make a good group on here.