Hullo again. This post is an annex to the previous one, so if it doesn't make any sense to you, go back a notch.
Also - sorry the previous post was so interminably long and rambling. I'll try harder for succinctness, next time, but may not succeed.
And now: here's the plant that made me think a high class tart had broken in.
Zaluzuanskya ovata a South African beauty which looks like a Silene but is related to foxgloves, snap dragons and figwort.
The red-backed, white-faced flowers are night scented but droop and half-close by day.