There are different ways to test emergency lighting in the UK, depending on the type of emergency lighting system and the requirements of the relevant regulations and standards. However, the following is a general procedure for testing emergency lighting:

Our experienced testers conduct over 14,000 emergency lighting tests every year in properties across the UK. They test and inspect all units to ensure they’re functioning correctly. Pre-service audit UK fire safety legislation states that emergency lighting is required in buildings to provide light if normal lighting fails during a fire. We also offer a number of additional services which are available alongside our regular monthly emergency lighting or weekly fire alarm tests. An Emergency Lighting Certificate is a document that certifies that the emergency lighting system in a building has been installed, tested and commissioned in accordance with the relevant regulations and standards. The certificate is issued by a qualified electrician or contractor who has carried out the installation and testing of the emergency lighting system. We can provide emergency lighting testing and servicing to ensure you are fire safety compliant. We can test your emergency lighting system at a time that suits you. The results of all testing and any necessary corrective action can be recorded in your fire safety logbook. This record is then available for inspection if required.This performs the same function as a key-switch, isolating the fitting from its permanent live supply and thereby simulating a power failure. Details of the testing and commissioning carried out on the emergency lighting system, including dates and the results of the tests. Non-domestic properties have a statutory responsibility to supply, test, and maintain emergency lighting systems. The reason for the regulations is to promote safety should the power supply go down for any reason. In such an event, emergency lighting provides illumination for safe evacuation or manoeuvre around the building’s interior. It can also support operational continuity in some contexts. Simulate a power failure by either an emergency key switch or by switching off the mains power to the emergency lighting.

The name of the person or organization responsible for the maintenance and testing of the emergency lighting system. Yes and no. If it is a small building and all the emergency lights are on one circuit, then yes, you have no choice. However if it is a large building then it would make sense to stagger the testing. This way the whole building would not be affected if there was a power cut, during the recharge time. Testing Central Battery Systems

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Records of all testing and maintenance carried out on the emergency lighting system, including dates, results, and any faults or issues identified. Now the refurbishment on the ground floor seems to be wired up in the 'new' way - does not extinguish power to mains.

The duration that emergency lighting should stay on for depends on the relevant regulations and standards, as well as the specific requirements of the building and its occupants. However, the general requirement is that emergency lighting should remain illuminated for a minimum of 1 hour, but it may need to remain illuminated for up to 3 hours in certain circumstances. You need emergency lighting in areas that could be considered “dangerous” such as commercial kitchens or plant rooms. If your building has rooms larger than 60 square metres, then emergency lighting is recommended. How long do emergency lights need to stay on? There are three widely used ways to test emergency lighting. To understand them it is necessary to understand first how an emergency light fitting is wired. Note that the remarks that follow apply to self-contained emergency fittings, not to central battery operated emergency fittings. Self-test has several benefits. First, it saves the labour of manual testing. Secondly, it removes the risk that routine monthly or annual testing is overlooked. There are different types of emergency lighting; it can be maintained, non-maintained, or combined. Often there are choices with how long they remain on after a power failure. Maintained Emergency Lighting

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In my humble opinion the switch should be of "simulation" status IE cutting power (as it would if in a power cut, fire, etc.) and illuminating EL only. They can also provide insights on the suitability of systems in respect of applicable British standards and codes.