Purple Flower in the Park

It was a lovely sunny evening and so I went for a walk in the park with my son and my mum. The light was lovely too, so I took the camera. I love the colour purple, and so I could not resist taking a photo of this flower. Love the way it looks from a 'tip down' perspective.

I do not have a clue what the flower is, so if anyone knows, please let me know too :D