The maximum quantities that can be stored under a registration are:
It is your responsibility to ensure you are aware of, and complying with the regulations on the manufacture and storage of explosives.
The licensing authority will not normally visit your premises before granting a registration. The authority may prohibit storage of explosives at the site if it believes the site is unsafe. It may also take enforcement action if you are not storing safely.
If you are planning to sell fireworks outside certain limited periods of the year you may also need a licence under the Fireworks Regulations 2004. Your supplier or local licensing authority will be able to advise you.