Hidden cameras could and have helped worried families find out about the kind of care their loved one was receiving, the care minister told Daybreak.
Norman Lamb said "there was no loss of dignity" with surveillance if the Care Quality Commission were on board as it was "all by agreement" and "might expose something dreadful".
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Among those murdered was Keith Palmer, an unarmed constable who "did his job and never wanted any fuss."
Top temperature 14 Celsius (57 F).