you in the UK have a very different way to DO banning!!!! You can have a simple national referendum and vote in Parliament and it's done!

Referendums in the UK are rare, not simple, and confined to constitutional issues, which guns are not.

http://en.wikipedia.org/wiki/Referendums_in_the_United_Kingdom

Bestiality isn't a constitutional issue either. Anybody who wanted to amend UK law to reflect the US and allow them to wave pistols and shag sheep would have to go through a different procedure.