@cicerone imposter,
I'm not wrong, you said 16% of the population were Germans. That's wrong, if you'd said 16% of the population could trace their roots back to Germany you'd be right.
Ethnic monitoring is carried out to ensure equal opportunities, especially in the public sector. Even then, it's not that specific. White British, White Other, AfroCaribbean, Asian is about as far as it goes. It's not used to label or categorise people.