An emergency plans procedure sets out what everyone in and around the premises does in an emergency, and how they evacuate safely. It covers far more than fire: gas, flood, terrorist threat, power failure and anything else that forces a building to react.
Your consultant identifies the site-specific hazards and areas that need to be covered, working from physical observation, a review of your safety documentation, and discussions with key personnel. The document is built for your building rather than adapted from a template.
In multi-occupied premises, tenants are responsible for evacuating their own part of the building while on-site staff take over for the common parts. Getting that handover written down and understood is the difference between an orderly evacuation and two teams assuming the other has it.
One site-specific document covering every foreseeable emergency, rather than a fire plan with the other scenarios left to improvisation.