Sow Thistle species

sorry about the blurred photos. I think this is Corn Sow Thistle (Sonchus arvensis) because of the shape of the end of the leaves being quite narrow, rather than a more broad triangle as with a few of the photos after a google search of Smooth Sow-Thistle. Also the picture in my book shows Smooth Sow-Thistle as having the more broad triangle at the end of each leaf.