Sub-250g Drones at Events and Crowds in the UK

The 1,000-Person Assembly Rule

Under the Air Navigation Order 2016, Article 94A, no person may fly a small unmanned aircraft over or within 150 metres of an organised assembly of more than 1,000 persons without the permission of the CAA. This is one of the few rules that applies to all drones regardless of weight class, including sub-250g models with C0 class markings.

This rule exists because of the safety risk that a drone falling into a dense crowd would pose. Even a sub-250g drone falling from 120 metres could cause injury to someone in a packed crowd, and the potential for panic and stampede adds a further risk dimension that the CAA takes very seriously.

The 150-metre horizontal distance requirement means you cannot simply fly alongside an event either. If 1,000 or more people are gathered, you must be at least 150 metres away from the boundary of that assembly in all directions.

What Counts as an Organised Assembly

The term "organised assembly" covers a wide range of events. It applies to any gathering that has been deliberately organised, rather than a spontaneous crowd. Common examples include:

• Music festivals and concerts: From large multi-day festivals to single outdoor performances
• Sporting events: Football matches, cricket, rugby, horse racing, athletics meets, and marathons
• Public celebrations: Bonfire Night displays, New Year celebrations, royal events, and parades
• Political gatherings: Protests, marches, rallies, and demonstrations
• Markets and fairs: Large Christmas markets, county fairs, and agricultural shows
• Religious gatherings: Outdoor services, processions, and festivals

The key question is whether the assembly is organised and whether it exceeds 1,000 persons. You do not need to count heads precisely, but if the event is clearly large enough that it could reasonably be expected to have more than 1,000 attendees, the rule applies. When in doubt, do not fly.

Smaller Gatherings: Still Risky

Even at events with fewer than 1,000 people, flying a sub-250g drone near crowds carries significant risks and may still breach other regulations:

• C0 drones in A1: You may fly over but should not intentionally fly close to uninvolved people. At an event, almost everyone is an uninvolved person from an aviation perspective
• Reckless endangerment: Under the Air Navigation Order 2016, flying a drone in a manner likely to endanger any person is a criminal offence regardless of the gathering size
• Event organisers: Most event organisers explicitly prohibit drones in their terms and conditions. Flying a drone at an event without the organiser's permission may result in ejection and a ban
• Venue rules: Stadiums, arenas, and event venues have their own security protocols and drone prohibitions

Getting CAA Permission for Event Flying

If you have a legitimate need to fly a drone at an event with more than 1,000 people, you must apply to the CAA for an exemption. This process typically requires:

• A detailed operational safety case explaining your flight plan and risk mitigations
• Evidence of appropriate drone insurance with public liability coverage
• Coordination with the event organiser and their safety team
• A qualified and experienced remote pilot, often holding a GVC (General VLOS Certificate) or equivalent
• A comprehensive risk assessment covering mechanical failure, loss of control, and crowd management scenarios

CAA permission for event flying is typically granted only to professional operators with proven track records. Recreational pilots with sub-250g drones are extremely unlikely to receive such permission.

Temporary Flight Restrictions at Major Events

For certain large-scale events, the CAA may issue a Notice to Airmen (NOTAM) imposing a Temporary Restriction of Airspace. This creates a legally enforced no-fly zone around the event that applies to all aircraft, including drones. Recent examples have included major sporting finals, royal occasions, and high-profile political events.

NOTAMs are published through the NATS AIS (Aeronautical Information Service) and can be checked through the NATS Drone Assist app. Flying within a NOTAM restriction without permission is a serious criminal offence.

Penalties and Enforcement

Flying a drone over an organised assembly without CAA permission can result in:

• Criminal prosecution under the Air Navigation Order 2016
• Fines that can reach several thousand pounds
• Confiscation of your drone by police
• A criminal record that may affect future travel and employment

Police forces across the UK increasingly deploy counter-drone technology at major events. Detection systems can identify drone signals and locate the pilot, making enforcement faster and more effective than in previous years. Several UK police forces now have dedicated drone units trained in both drone detection and pursuing offenders.

Safe Alternatives for Event Footage

If you want aerial footage of an event you are attending, consider these legal alternatives:

1. Fly your drone before the event begins or after crowds have dispersed, maintaining the 150-metre distance from any remaining assembly
2. Use an elevated vantage point instead of a drone, such as a nearby hill or building (with permission)
3. Contact the event organiser about their own aerial footage, which many events now produce professionally
4. Photograph the venue or location on a different day when no event is taking place