Have you considered a dawn/dusk light with a low energy lamp? We
have one outside with an 11w lamp, cheap enough to run, on when its
dark.

Thanks. I'll try her on that but as a pensioner on a low income who has
also been subject to the full energy conservation indoctrination I don't
have high hopes. (She is also good at mental arithmetic so she'll
probably work out the annual cost faster than I can in Excel.)

I ought also to have said that I'd assumed even the PIR option needs a
switch somewhere accessible to comply with the regs. Or not?
--
R