In article , Ellie100
writes

I was thinking one rectangular window box and a couple of pots. Any
suggestions for some attractive, smart-looking plants which like these
kind of conditions? I try to look after the plants as much as
possible but I work long hours so ideally need something which can
stand to be neglected and not watered for a few days (even in summer)
and which won't look too straggly in the winter (when I get home well
after dark and never even see the garden!)

You could try various cacti and succulents - say aloes for spiky
attractive leaves and possibly spikes of orange flowers, trailing grey
leaved crassulas. These aren't normally hardy, but I have a window box
on an E wall in Leeds, window of a very marginally heated toilet, and
aloe and echeveria have lived there happily for several years. In
London, you stand an even better chance.

Some cacti will take surprisingly low temperatures if they can be kept
bone dry.
--
Kay Easton

Edward's earthworm page:
http://www.scarboro.demon.co.uk/edward/index.htm