You are being audited.

This is what you need to know!

This is not a contract; it's a best-effort statement of existing law in the UK that you must abide by whether you read this or not.

It is a reasonable and lawful activity to film anything visible from a publicly accessible place for the purposes of an audit, informational video, or evidence collection.
Examples of usage might include improving online directories, crowd-sponsored education of security industry employees or access for disabled people.
Anything seen from a publicly accessible space is accessible to the public.
Auditors who are generally not incorporated are not bound by data protection laws and do not need to give their name or show you the recording, even if they make a profit.
Most of the time, auditors are not required to give their name to any police that attend unless an officer has reasonable suspicion of an indictable offence.
Many public services film buildings accessible from public spaces, such as private CCTV, Google Street View, news agencies, or aerial land surveys.
If you genuinely believe filming might cause a national security issue (affecting the country's security, potentially requiring military response), inform the auditor and call 999.

You need genuine, evidence-based suspicion—grounded in facts that would convince a reasonable person—to perform detention, arrest, or search without consent. It is illegal to base suspicion on discriminatory factors like gender, race, disability, or orientation.
No reason is required to perform an "audit" (essentially an informational video), but auditing itself is a lawful reason. Performing an audit alone is not reasonable grounds for suspicion of an offence.
A "reasonable person" is legally defined as someone aware of relevant laws and common understandings.
Anyone conducting a search, detention, or arrest without consent must be able clearly articulate the suspicion to a reasonable person and must express it in court proceedings.
Failure to disclose suspicion when asked (without valid justification) may result in potentially unlimited compensation claims for wrongful detention, search, or arrest.
Public videography often serves to educate the public about legal rights and should not be automatically assumed criminal.

You may legally access private land connected to public roads and footpaths if there are no signs or locked gates.
Requests to leave shared public spaces (e.g., access footpaths) require permission from all parties with access rights. Failure to confirm this permission risks legal action against you.
Land open to the public is treated as a public space regarding filming and photography.
Public rights of way are public spaces, and permission to fly drones is assumed if there are no signs.
If a member of public is asked to leave a public right of way on private land, they have reasonable time to leave and can then repass the path or bridleway once they have left at any time.

Drones weighing 249g or less may legally fly in residential, industrial, and commercial areas without flight restrictions (e.g., near prisons or airports). Source: Civil Aviation Authority
The filming location is defined as where the drone takes off or lands. Source: Filmlondon.org.uk (aerial photography experts)
Most CAA restrictions apply to drones weighing 250g or more.
Auditors profiting from drone use will usually have insurance.
Registered pilots display an Operator ID on the drone, which must be provided after accidents. No obligation exists to share this ID otherwise. CAA guidance for 249g drones
Normal flight cannot cause trespass. Civil Aviation Act 1982, Part III, Section 76 (1).

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