I wouldnt know about the DNA thing, littlek, maybe a scientist looking in will be able to help.
When they do these types of survey in Britain, they always ask around for information on local families that can trace their lineage, to that particular area, back to 1850 or so.
If your family was around in the same village at that time, chances are that your lineage will go way back in the same area, as people didnt travel before the mid 19th Century.
The BBC made a documentary series, called "Blood of the Vikings", which involved a similar sort of testing (Y chromosome....men tested only, as it passes only from Father to Son) and came up with some very interesting results. Well worth watching, if you ever find it in your local Library.