I've recently moved house and "inherited" a part established garden. Could anyone please help id this shrub-like plant. It was growing in a bed behind a pond, although the bed is quite dry. I have now moved it to another bed, without first checking if it would survive!

The plant is shrub-like, with stems 10-20cm long with pointed hairless mid-green leaves about 1com in length. At the top there are some purpley leaves which I think may be flowers as they are in a different formation to the rest of the leaves.

Any help greatly appreciated :)

Image link: