You Are 30% British
You're about as British as a half hearted Anglophile... in other words, a piss poor Brit.
If you are indeed from Britain, you probably consider yourself a European more than anything else.
If you're trying to pass for a Brit, you're going to have to try a little harder.
Go to a football match. Drink until you puke. And head in to work the next morning totally hungover.