But it would be churlish to refuse to follow the guidance.The fact is that 'Approved Document P' does, indeed, suggest that what you say is true - and many people seem to believe that it is true (presumably because of that document, and books which have 'copied from it'). However, that is just a (seemingly not very well written) 'guidance' document, and the 'actual law' (Schedule 4 of the Building Regs) appears very clear in saying that installation of any 'outdoor lighting installation' is notifiable.