The existence of CCTV material should always be considered as a reasonable line of enquiry in a police investigation and investigators will usually view / review any CCTV that they are aware of before making a decision as to whether the footage is relevant to the investigation.
If you are aware of the presence of a CCTV camera at a location where a crime / vehicle collision took place, we would suggest you make the police aware of this when you report an incident / collision.
Please also see the Government website in Related Information regarding requesting CCTV footage of yourself.
