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 expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.
A wet, wintry night in places with rain and hill snow slow to move away from southern Scotland and northern England.