parts l & b make up the principle areas within the realms of lighitng. here are the online copies available for download.
Part L & B are the approved documents from the office of the deputy priminister and form part of the building regulations 2000
part L1a - Conservation of fuel & power - new dwellings
part L1b - Conservation of fuel & power - existing dwellings
part L2a - Conservation of fuel & power - new buildings other than dwellings
part L2b - Conservation of fuel & power - existing buildings other than dwellings
part B vol 1 - Fire safety for dwellings
part B vol 2 - Fire safety for non-dwellings