I believe these brother clades to R-U152 and R-L21 include the
Basque/Iberian migration to the British Isles. R-U152 is noted in
Spain @ http://freepages.genealogy.rootsweb.ancestry.com/~nolenancestry/page12.htmlhttp://www.tutorgig.com/ed/Haplogroup_R1b_(Y-DNA
"R1b1b2a2c (M153): This haplogroup has been found so far in 39
individuals, most of them Basques; the rest were likely of Iberian
ancestry or have not been classified ethnically. The first time
it was located (Bosch 2001) it was described as H102 and included
7 Basques and one Andalusian.
R1b1b2a2d (SRY2627 or M167): The first author to test for this marker
(long before modern haplogroup nomenclature existed) was Hurles in
1999. He found it relatively common among Basques (13/117: 11%)
and Catalans (7/32: 22%). Other occurrences were found among other
Spanish, Béarnais, other French, British and Germans.
In 2000, Rosser also tested for that same marker, naming the
haplogroup Hg22, and again it was found mainly among Basques (19%),
in lower frequencies among French (5%), Bavarians (3%), Spanish (2%),
Southern Portuguese (2%), and in single occurrences among Romanians,
Slovenians, Dutch, Belgians and English.
In 2001, Bosch described this marker as H103, in 5 Basques and 5
Catalans. Further regional studies have located it in
significative amounts in Asturias, Cantabria and Galicia, as well as
again among Basques. Cases in the Azores and Latin America have also
been reported. A total of 85 individuals with this haplogroup have
been found so far, almost all of them in academic studies, making it
the best documented R1b1b2 subclade."