This is from https://www.real-gun.com/
Deactivated Guns and the law:
Real-gun.com cannot sell deactivated guns to anyone under the age of 18. Though are not required to store this in a gun safe it is advised you store them in you dwelling, preferably in a locked cupboard. When transporting de-acs please keep them in out of site, preferably in a gun bag. Be sensible - don`t mount a .50 cal on the roof of your Jeep and take a drive - its fine on private land at shows but given the current climate please do not stress our Police any more than they currently are!