alt Hacker NewsYou are technically correct. But the distinction between devolution and a Federation of states gets very blurry when you take a look at what's happening with voting in the US these days.
You are technically incorrect about the UK not having a constitution. It's just not all compiled into a single written document.
Technically correct only if you accept "vague set of traditions" as a valid definition for "constitution". This both contradicts common usage and enables tyranny, so I recommend rejecting it.