Chief Constable Alexis Boon tells the BBC the footage of how the murder victim had been treated was distressing.
It comes after the Reform UK leader said the public should respond with "pure, cold rage" to the actions of police.
The Royal Family, prime minister and head of the navy offer condolences after the crash in Devon.
The Independent Office for Police Conduct's is reviewing a guidance document from the National Police Chiefs' Council.
A newly-published report suggests a moderate lifestyle in retirement costs £32,700 for one person and £45,400 for two.