We currently have toilet cubicles which have gaps under and above the walls and door which allow light from the emergency lighting in the room to penetrate everywhere. We are about to block these gaps for additional privacy so each cubicle would be contained. Do we need to install additional emergency lighting in each cubicle?

If you cannot help could you recommend where I can get an answer.

Thank you kindly.

In accordance with BS 5266 pt 1:2011 it says,

Toilet facilities

Facilities for use by disabled people and/or any multiple closet facilities without borrowed light should have emergency escape illumination from at least one luminaire.

I would say you do have to provide emergency escape lighting in each cubicle, if after the proposals there is no borrowed light or you could provide translucent material above the doors to ensure you do have borrowed light.