Because the UK gov doesn't want a system like theirs.

You don't need to keep Europsplaining to Brits. We aren't all idiots. We know you have ID cards etc and we know about Estonia.

Also if we reject one your ideas, it's not always because we misunderstood it - we can understand it AND think it's a bad idea. I know that often hurts the egos of Germans, the French and the Dutch ;(!

It's funny because it's often Europeans not understanding British politics...the irony ;)