Hanging Purple Plant

In the latest post from Garden Bloggers Blooms Day I showed a new purple flower and I am still none the wiser as to what it is. It began in the hanging pot, which up until recently looked like this.

With the strong winds causing it undue stress I transferred the purple flowers and the blue cornflowers to a large ground level pot and this pot is happily sitting up by the dividing wall.

The hanging pot now houses two little yellow cherry tumbler tomato seedlings.

But I still don't know what this purple plant is!!!

Any clues?