There are quite a few different products available. Here are some:
- AncestryDNA *
- 23andMe.com **
- FamilyTreeDNA (see Michael's note below)
- KnowYourDNA.com (a way to find all things related to DNA)

* - Ancestry does not test in the UK. Once you have tested at FTDNA you can go on to Ancestry.com, not .co.uk, and upload Y results for free.
** - 23andMe does not do the same type of Y testing as FTDNA.

Both Jeanie Atkins and Michael Sandford have done a lot of work with FamilyTreeDNA and have started DNA projects for both the Brereton and Brewerton lines. PLEASE READ THIS DNA INFORMATION FROM JEANIE. Here are some Frequently Asked Questions.

From Alyn Brereton ... Calling all Breretons!!!

From Bruce Brereton: I have tested on all 3 sites. Paternal haplogroups are families of Y chromosomes that all trace back to a single mutation at a specific place and time. By looking at the geographic distribution of these related lineages, we learn how our ancient male ancestors migrated throughout the world. From 23andMe, here is mine:
      - R1b1b2a1 is a subgroup of R1b1b2

A note from Michael Sandford:

Here is a link to order a dna test kit through the brereton dna project:
   - https://www.familytreedna.com/group-join.aspx?Group=Brererton

Yes, that spelling in the link is Brererton which is odd, but it seems to be the only way to get to the right page in a single click. I queried it. The project was Brererton/Brereton but had no members before July when Jeanie joined and we got them to change to Brereton. I found 3 Brererton in bmd against 13,545 Brereton so I dont expect many Brerertons! Apparently it is too difficult to get ftdna to change from Brererton to Brereton in the page url although they were able to change the text.