Little Blue Flower

In an attempt to introduce some greenery into the pond I sometimes collect a piece of weed when about for walks.
I can't remember where this came from but, as the pond is full of algae,  it is still living in a garden tub of rainwater. Obviously it is quite happy there as it has gown considerably and produced little deep-blue 4-petalled flowers, about 5mm across.
I believe it is called Brooklime (Veronica beccabunga) a member of the Speedwell family and is my contribution to the Tiny Tuesday challenge, thanks to H0tamer for hosting.