Well I'm familiar with them, I still have both Shot gun and Firearms certificates,
A little know fact is that if you have a British registered sea going vessel, you can still legally posses ANY firearms without a firearms certificate.
I once bought a Stainless Steel .357 Magnum! I still have a Stainless Steel .320 Ruger bolt action rifle, with red dot and Laser/ telescopic sights, plus a plethora of shot guns.
Chrispy.