From the latest NRA (UK) news letter

Proposed United Nations Arms Trade Treaty
A Conference to discuss the text of a proposed United Nations Conventional Arms Trade Treaty will begin on 18th March. The Treaty is intended to control the legitimate trade in military arms of all sorts from warships to small arms. The draft Treaty originally contained exemptions for sporting arms and antiques, but these do not appear in the latest draft. While the Treaty should not affect the possesion or movement of firearms in Britain or the EU, it could make it far more difficult for hunters or target shooters to take their personal firearms outside the EU. The additional bureaucracy would also make more expensive the international trade in sporting firearms, already tightly controlled, thus putting up the cost of our sport.

In order to support moves to re-instate exceptions in favour of the legitimate shooter and collector and the civilian gun trade, please send an email as soon as possible and definitley by the 26th March to the Arms Trade Treaty Desk Officer at the Foreign & Commonwealth Office. The address is:

Your message should request that:
1) Civilian firearms should be excepted from the proposed Arms Trade Treaty.
2) All temporary exports and re-imports of firearms, where no change of ownership occurs should be excepted from the proposed Treaty.
3)Antique firearms, as defined in the UN Vienna Firearms Protocol, should be excepted from the Treaty.

National Rifle Association of the UK | NRA | News | All

Probably wouldn't hurt to write to your MP too...