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In the absence of a view of the foliage it's hard to tell, but might it be Sonchus arvensis?
Yes you are right thats what it is, I checked my records and I have more photos I have taken here before. Knew it wasnt quite right as the flowers were too big!
Gardening for Wildlife
Lat/Lng: 54.855, -4.908
OS grid ref: NX134550