As a responsible shooter, you need to do your bit to prevent crime. Which means taking every precaution for gun security in your car. Bill Harriman advises
Precautions when leaving guns in cars
The Home Office guide has helpful advice about leaving guns in cars: “19.49) Any firearms should be hidden, preferably in the locked boot or other secured load carrying area of the vehicle. The vehicle should not be left unattended for long periods whenever possible. Vehicles which have to be left unattended for any length of time should ideally have an immobiliser and/or alarm fitted. 19.50) If the vehicle is left unattended for any reason, firearms should be concealed, preferably in the locked boot or other secured load carrying area of the vehicle.
“Where practicable, the bolt, magazine or other operating part should be separated from the firearm and either carried on the person or kept in a locked container, ideally secured to the vehicle, or concealed elsewhere. Any ammunition should be stored separately from the firearm and concealed from view. The vehicle should be locked, and any immobiliser or alarm should be set. Where possible, the vehicle should be parked within the sight of the responsible person and in a position that would frustrate attempts to enter the vehicle unlawfully (eg. with the boot close to a wall).”