Where Did My British Ancestry Go?

I was alerted by a post on Facebook from Megan Smolenyak that the Ancestry DNA results had been updated and refined.  I had done the DNA test in the last year or so and I was anxious to see what new details came to light.

Imagine my shock when I see the new details virtually erased my British ancestry!  (see before and after image)  In the first round of DNA testing Ancestry said I had 71% British ancestry. That fits pretty well with what I know about my ancestors.  In round 2 Ancestry relegates my ancestry from "Great Britain" to less than 1%. 

I can see that they are now separating out Ireland from Great Britain. I have one great grandparent with ties to Ireland. All the rest of my British ties come from England, Wales or Scotland.  The increase to 19% Irish seems very high. 

Also, my Scandinavian ancestry, of which I have no verification whatsoever from my own research, increased from 12% to 25%.  The only thing I can imagine is that I had long time ago Scandinavian ancestors who settled in Scotland.

Or maybe I'm looking at this all wrong.  After all I really don't understand the ins and outs of autosomal DNA.  Perhaps the testing represents what I've been given from my ancestors passed down through autosomal DNA instead of an even spread of DNA from all my ancestors.  Someone more knowledgeable will have to advise me on this.

At this point I am left with more questions about what Ancestry's DNA testing represents than I am with answers about my ancestry.