The new Police Arms Code 2017 is out and you are now expected to justify the number of firearms you own, from the Arms Code page 43:

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“A firearms licence allows the holder to have and use sporting type shotguns and rifles. A licence holder may possess any number of sporting-type rifles and shotguns although you will be required to justify the number of firearms you hold when the Police inspect your firearms security.”

We are still working our way through this document but keep in mind that the National / Labour led Law and Order Select Committee into how criminals are obtaining guns wants to codify parts of this arms code into law.

Download and read here:

EDIT: Police have since removed the content from the link, here is a mirror: