Question: For communal residential properties - is there a requirement to provide emergency lighting within each tenant flat?
Answer: Generally no - premises should be provided with lighting to ensure that, in the event of a fire within the premises, suitable lighting is provided to assist in the evacuation of the premises.
Tenants should be familiar with their own flat and should be able to find their own way to the communal area/staircase, which would generally have some form of emergency lighting.
You can obtain further information from the Local Authority concerned and/or guidance from the 'Landlord’s' Guide to Electrical Safety', issued by the Electrical Safety Council, or by government sites dealing with fire safety.
See also the BS 5266 series dealing with emergency lighting.