The Police have a limited power to retain samples from a person prosecuted but not convicted for certain sexual/violent offences.
Samples taken in other cases may not be retained and must be destroyed if the person is not convicted or proceedings are otherwise brought to a halt.
Each force will have its own policy on this and you will need to contact them. If you believe there is enough evidence within the vehicle that may provide fingerprints or blood DNA, then this should be specified when you report the crime so the SOCO can attend. Try to avoid touching items within the car until this has been done. Also ensure the car remains secure throughout e.g. board up/replace windows.
If the place where the fingerprints are can be removed, say a CD cover or a can of de-icer then keep the item safe pending the advice you receive from your force.
See the website in related information, which is a website where you can register free all property with a serial number.
