I recently sent my raw genome data from 23andMe to Dr Doug McDonald for his BGA analysis. My paper ancestry is largely English with an emphasis upon Yorkshire and Suffolk. I have a substantial Norman ancestry too in terms of numbers of Norman-derived surnames in my family tree and from pedigrees and paper-trails.
The results were remarkably accurate. His PCA scattergram placed me firmly within the English cluster, with a small pull towards northern France which probably reflects this Norman ancestry.
Would other posters care to exchange their McDonald analysis results and experiences? I would welcome them.