I know that I am mainly from Pennsylvania German and Swiss heritage. My updated results are about 65% British with Western Europe and a smattering of other ethnicities.

When they released the new ethnicity version in August they published a white paper in which they state that they have difficulty in determining British and West European. The British are from germanic tribes and there has been much migration back and forth in that area for centuries.

The ethnicity results from all the companies are a relatively new science and should be taken with a grain of salt. I think mine are fairly accurate, but other people do not think they reflect their known history at all.