Waterproof Wrap

This is the UK, and it will probably rain. Waterproof Wrap seals your fuses and cakes against the wet so a bad forecast does not end the night before it starts.

Wrap the fireworks when you set them out, then unwrap each one as you come to it. It keeps water off the fuse, which is the part that suffers first in the wet. Worth doing even when the sky looks fine, because November rarely gives you much warning.

Cheap insurance for a display you have already paid for. Keep a roll with the firing gear and you will use it every year.