+++ STOP PRESS +++ 20/11/18: "Can DNA tests help you?" — latest update from FFHS.
The author of the DNA articles last Summer has now produced his promised update, that you can download here.
... ... ... ...
12/7/18: Our attention has been drawn to an article on the privacy issues surrounding DNA tests: read it here.
We understand that an update, on the whole subject of DNA testing, is planned.
Of course, AncestryDNA's terms and conditions may have changed since the first article was written, but nonetheless you may still wish to refer to it (and follow the links from it) — and "read the small print" — before you decide whether to use such DNA testing services through Ancestry (or indeed any other organisation).