The high frequency of G2a haplogroup in Neolithic specimens, whereas this haplogroup is very rare in current populations, also suggests that men could have played a particularly important role in the Neolithic dissemination that is no longer visible today. This would imply that intra-European migrations related to the metal ages may have strongly affected the modern gene pool.
I was intending to comment more, but for now I'll just mention:
(1) I agree with Jean M.: "MtDNA haplogroups were K1a (3), T2b (2), and one each of H3 and U5. Since it seems very likely that all of these except the U5 arrived in the Neolithic, I cannot agree with the conclusions of the authors that the spread of farming was male-led."
(2) The confirmed presence of E-V13 in Neolithic western Europe reinforces for me that those wanting to attribute the reported elevated levels of E-V13 in NE Wales to "Roman soldiers" or the like are probably mistaken.