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
Shotgun certificate holders have a duty of care
Every shotgun certificate carries a statutory condition that imposes a duty on the holder to look after the shotguns to which it relates. It is a criminal offence to fail to comply with a condition on a certificate. The penalties are draconian: up to six months in clink, a fine of up to £5,000 — or both.
Condition 4(b) on your certificate says: “When a shotgun to which this certificate relates is in use or the holder of the certificate has the shotgun with him for the purpose of cleaning, repairing, or testing it or for some other purpose connected with its use, transfer or sale, or the shotgun is in transit to or from a place in connection with its use or any such purpose, reasonable precautions must be taken for the safe custody of the shotgun.”
The most important words in this are “reasonable precautions”. The Oxford English Dictionary defines reasonable as: “Not greatly less or more than might be thought appropriate.”