A study of the history of brown bears in Britain:-
Lost history of Britain's bears revealed
....It is not possible to say exactly when and where bears died out in the wild, as there is little evidence from natural sites, such as caves, fens and bogs.
One scenario, based on evidence from a cave in the Yorkshire Dales, suggests the brown bear went extinct in the early medieval period - between about 425 and 594 AD.
However, there is a slim chance that the Yorkshire cave bears were descendants of bears imported into Britain from elsewhere in Europe by the Romans......
Lost history of Britain's bears revealed
....It is not possible to say exactly when and where bears died out in the wild, as there is little evidence from natural sites, such as caves, fens and bogs.
One scenario, based on evidence from a cave in the Yorkshire Dales, suggests the brown bear went extinct in the early medieval period - between about 425 and 594 AD.
However, there is a slim chance that the Yorkshire cave bears were descendants of bears imported into Britain from elsewhere in Europe by the Romans......