https://en.wikipedia.org/wiki/Towcester
Location of R-FT81743 about the end of Roman Times 400 CE (Saxon) Watling St (A5) Wessex & The Danelaw
https://en.wikipedia.org/wiki/Watling_Street

https://discover.familytreedna.com/y-dna/R-FT81743/tree

Entry to Britain around 700 BCE and remaining along the east coast until after Roman Times around 500 CE. https://en.wikipedia.org/wiki/Bronze_Age_Britain#