What does the P312/U106 clade ratio tell us?

[Cofgene]

Is that what Iain McDonald thinks?

No. Just my thought. Conceptually testing bias should get more pronounced closer to current time due to what we know about composition of regions such as the British Isle. If that same composition was present across continental Europe one wouldn't need to consider the bias present in the counts of more recent haplogroups.

[rms2]

Partly that but it could also contain sampling bias for recent British Isle clades due to under representation of continental results.

Isn't U106 pretty well represented in the most heavily populated parts of the British Isles?

P312, especially L21, is dominant in the Celtic Fringe countries, but their populations are much smaller than that of England, especially SE England, where U106 has its highest frequencies outside the Netherlands.

Under-representation of the Continent is also likely to favor U106 rather than P312.