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As far as I know (could be wrong) yes, you have to do this if your licience expires before you receive your new one. Don't think it's just a recommendation.

Yet as obove in other cases a chain and padlock around a hot water cylinder is adequate?

Your son will have to get a safe installed in that case. Short of moving back home.

Surely there is someone in your neck of the woods that could check your safe on behalf of your son's interviewer and give the thumbs up. That is where "his" rifles will be stored after all.