Acts of Parliament

[oap]

Which Act of Parliament governs the sale of fireworks?

[Mumof2]

http://www.opsi.gov.uk/acts/acts2003/ukpga_200 30022_en_1

This might be it but I haven't looked into it further

[Buenchico]

The link provided by MumOf2 goes to the relevant primary legislation but that includes 'enabling powers' allowing the Secretary of State to introduce Regulations which define the 'small print' of the law. So, to get a full statement of the law, you need to read both the primary legislation and the relevant Regulations. They're all available here:
http://www.statutelaw.gov.uk/SearchResults.asp x?TYPE=QS&Title=fireworks&Year=&Number=&LegTyp e=All+Legislation

Chris