This haplogroup is one allele away from being the Atlantic Model. It's beginnings go back 4,000 to 8,000 years ago in SW Asia and it spread into Western Europe. The Atlantic Modal Haplotype, or AMH, is the most common STR haplotype in haplogroup R1b1b2a1a. Since I have just gone for a test of 12 alleles I don't know what else our group would be called.
The Henwood line I have found goes back to the 1500's in Hampshire, England. That's Western Europe. I don't know when they entered there from SW Asia, but 4,000 years ago would be about 2,000 BCE. At that they've been in England forever, it seems. It would be interesting to check out the history of England at that point in time knowing this. Were others in England?
This information came from ISOGG's latest 2010 Y-DNA Haplogroup R information.