Norman conquest transformed Wales more deeply than England

Which part of the British Isles was most transformed by Norman influence?

Wales, because England retained more Saxon structures and personnel beneath Norman rule.

Wales appears as the part of the British Isles most deeply changed by Norman conquest. In England, Norman rulers inherited many Saxon institutions and placed a new elite over them. Much of the middle social order and even a number of lords remained Saxon, preserving important continuities beneath the regime change. Wales experienced a more disruptive conquest, making the difference between institutional takeover and territorial transformation especially visible.