I think that looks like Rhodochiton, tho' i can't be sure from the photo - it's an annual here in the UK, as it doesn't like frosts.

Thanks for such a speedy reply. Further searching confirms that it is Rhodochiton. I would never have found that myself. I will attempt to grow it from seed next year.

You're welcome - I believe that they're easy to grow from seed. :-))

I find the seed that I collect from my plants has a better germination rate than the seeds you buy - I have a theory that it's due to the fact that the bought one has the outer husk of the seed removed. Seems bizarre I know!