I participated in an East Anglia study for Y and mtDNA. The person in charge at the time concluded that my mother's H mtDNA had a few variations from standard that indicated her female line had been in England for a very long time.
The Y-DNA indicated that my father's male line probably came to England after the Romans left or sometime after 400 AD. His ancestor could have been part of an invasion. The Y-DNA was Haplogroup R1b with a positive test result for 312. It was thought that some time long ago I had an ancestor who spent time around the Rhine River Valley.