Plant ID

Does anyone know what this plant is called? It dies down completely during the winter. I have a similar one in the garden but its leaves are not variegated, just green. Otherwise it looks the same.
The variegated one in the pot was given to me by a friend, but she couldn’t remember what it was, only that it spreads, so is better in a pot (The unvariegated one certainly does spread).

 

Sorry, just realised I’ve posted this in the “how to” thread. Will repost in the plant ID thread.