Thanks to the 102 people who participated in this survey.
In response to the question "Working back from yourself along all your ancestral lines, at which generation do you first encounter someone for whom you can't
A surprising result is that 50% of those with a suspected Irish brickwall stated 2 times great-grandparents whereas for those with an English or Welsh brickwall 39% stated great-grandparent and only 22% two times great-grandparent.
As mentioned in a post yesterday slightly more men than women were the brickwall person. The survey was dominated by 74 responses from Canada where the trend for men to be the brickwall person was even more pronounced.