The surname DNA project at familytreedna.com for these surnames (Sennett, Sinnott, Sinnett, and any similar spellings) has just got up to five more sponsored DNA tests available to be sent out to people living in the UK (you just pay return postage to US). These are Y37 tests, but the project also has funds available to upgrade any DNA project members as far as BigY if your initial results indicate they may help fill in an untested area of the surname study genetic tree. Please comment, or message me, or use the admin contact link on the surname project home page if you are interested, and I can give you more information. Any male with one of this group of surnames who has already done an Ancestry DNA test is also welcome to use the link to upload their results to the project. This page has more info, the admin contact link, and the project join link.
https://www.familytreedna.com/groups/sennett/about
