And another picture showing the form of the plant:

and one more for size:

It is Nerium oleander, commonly called Oleander. Tough as old harry and undervalued. Easy to grow and drought tolerant. Reputed to be poisonous but I believe it to be unpleasant to eat.
More details on the net.

Heh heh! That's great Arthurm. I am in complete agreement! Right, I'll go look it up. Thanks a million.

Yes, and in the sub-tropics they look good. You know you can also train them to grow as a single truck tree simply by cutting away at ground level any extra shoots. You need to do it for a few years but eventually you can produce an attractive single truck tree. The sticky sap though as you prune is something you have to put up with - just don't suck your fingers clean! They are also very easy to propagate from cuttings.