To obtain authority to possess, purchase, acquire, manufacture, sell or transfer prohibited weapons and prohibited ammunition as defined by Section 5 of the 1968 Act a dealer must contact the Secretary of State via the Firearms Section of the Home Office at the following address:
Public Order and Police Co-operation Unit
5th Floor
Fry Building
2 Marsham Street
London SW1P 4DP
Tel: 020 7 035 488