Bryan Sykes tested 20 people in Cheddar Gorge and got two exact matches with Cheddar Man and one with a single mutation difference. Since the two exact matches were children they focused on the near-match, the teacher Adrian Targett.
Manco says that a modern-day Briton with U5 mtDNA could have a Saxon or Viking or Norman matrilineal ancestor. "Indeed it seems likely that most U5 in Britain today descends from Copper Age arrivals at the earliest."
(The Copper Age is the period just before the Bronze Age--much later than Cheddar Man who lived about 7000 B.C.)
Posted in 1997:
Descendant Of Stone Age Skeleton Found (Cheddar Man - 9,000 Years Old)
Both are really old haplogroups.