A clearer starting point.
Start with the event, not a headcount
The purpose, venue, audience, timing and other arrangements shape the question. A private reception and a large public-facing event need different considerations. Do not use a generic staffing formula as a substitute for assessing the actual event.
Separate responsibilities
Security, stewarding, venue management, health and safety, accessibility and emergency arrangements may involve different people and duties. The organiser should establish who owns each decision and how parties will coordinate. A security contractor should understand its agreed role without being presented as responsible for the entire event.
Brief early and review changes
Share a general event outline with prospective providers in time for a sensible discussion. Material changes to the venue, audience or programme may change the appropriate scope. Keep detailed plans, access information and sensitive operational arrangements within authorised private channels.
Use current authoritative guidance
The Health and Safety Executive explains organisers’ duties and event management. Requirements under terrorism-protection legislation and other rules may depend on the premises and event; check the latest official guidance and obtain appropriate professional advice rather than relying on a short public checklist.
Official guidance
For current regulatory or public-safety detail, use the original source:
For a service-specific conversation, explore the relevant Cobra service or enquire privately.