In uk.d-i-y, neverwas wrote:

My thoughts are a porch light only switched from outside would be of
limited use. If you can find your way to the porch in the dark
finding the switch would be as difficult as putting the key in the
lock? And you might want to switch it on from inside to see who's at
the door?

Fair points but the hall and kitchen lights let her see who is at the
door from window (although as a rule she does not even go to the door at
night unless she is expecting someone). The light is to replace a
battery powered light she has on the porch wall to see to use her keys
when returning in the dark in the winter.

Why is it being replaced?

A remote would make more sense. Put it on the house door keying.
Something the size of a car remote wouldn't be too arduous to carry
in the handbag.

Thanks. I'll clearly have to look again/elsewhere. The few I saw for
exterior lights on the TLC etc sites seemed to have much bulkier remotes

You could screw the bulky remote control to the wall, like (presumably)
the existing battery-powered light.

--
Mike Barnes