Once the person is deemed to be fit to posess a firearm/shotgun, then arbitary restrictions on this or that type of firearm, are of little benefit to the safety of society as a whole. The bushcraft equivilent would be banning edged tools with one type of grind, rather than another, because that happens to be what criminals are found with.
Or banning knives less than X length, as they are concealable. (Which is a direct analogy of the pistol ban we had in 1996/7.)
The ban on pistols, on the face of it may sound reasonable. But how much effort would it take to conceal a longer gun? very little. So it is still down to: can the person be trusted?
The conditions on firearms certificates do restrict where you can use them. Which will be something like 'on ranges constructed for that class of weapon' (I don't like their use of the word weapon though), or 'land deemed suitable by the Chief Constable'.
You could only shoot a firearm in the back garden, legally, if you had a suitable built and certified rifle range.
If it were to be an airgun, it could be used anywhere where you have permission, but there are very heavy penaltiesfor any errant shot. There are lots of people who like to plink at a target in their own garden, and do so safely and responsibly.
Jules
(Excuse the lack of spell check.)