You have to have a Possession and Acquisition Licence (PAL) to buy or possess a Non Restricted Firearm and a Restricted Possession and Acquisition Licence (RPAL) to buy or possess a Restricted Firearm (Handgun, listed rifles).
The rulers recently prohibited 1600 + firearms regardless of the licence you hold and those firearms are now paperweights that cannot be sold or traded to others including dealers. Two years of 'amnesty' then you have to surrender them or go to jail. Isn't freedom wonderful?