Belvoir Castle – 4 great firework displays! Three of the UK’s best firework companies compete against each other with a 10 minute firework display choreographed to music followed by a finale display from organisers MLE Pyrotechnics. The types of fireworks being used by the companies are quite different to the material available to the general public, each company uses category 4 fireworks – those that are for professional use only and the biggest available in the UK.