Posted: 28/02/2013 at 13:45
It will be a davidii , I should think, they self seed everywhere. When it does flower, you can cut of the dead ones and it will flower again and seed everwhere! It will probably be ok in the shade, Mine are all over the garden, shade and full sun, they dont seem to mind.
It really benefits from a hard prune, there is an article in the garden mag this week, he has taken it down to about 8 inches.