Purple Flower - Thistle or Knapweed

As I was out photographing villages, I walked through a meadow of wild flowers, of which this purple flower was among them. I thought it was from the Thistle family but after looking through my flower books, I'm not so sure. It may be Knapweed?

The flower is purple with a very open, ragged, appearance and has thick, fleshy, stems with a leaf, resembling a dandelion leaf.

I thought it was very pretty and hope you will too.

Thanks for viewing. :)