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Common Knpweed will have single lanceolate leaves unlike greater knapweed with Leaves usually pinnately lobed with oblong or linear segment flowers are also different
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Common Knapweed has simple leaves up the stem to just under the flower. Greater Knapweed has the leaf free stem immediately below the flower and the leaves are pinnately divided.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 50.8855, 0.3074
OS grid ref: TQ623120