The known surnames of persons in this group to 5th cousin level are; Davis, Barns, Gatrell, & Preston. There are a number of gaps in our knowledge of ancestors at this level.
The link to the Davis' of Christchurch has been revealed by a link to Lesley Davis, #8302 who has a line back to John Davis, #1445 and Sally Barns, married in Christchurch in 1795, our common ancestors.
Another link to this Davis line is from Edward Henry Collington of Poole, #7449 to Lesley B Collington, #8815, a granddaughter.
No other links have come to light at the time of writing, 25/9/19.