I'm a little confused by the large petals. Do they do that when they first open?
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You need to look at the leaves where they clasp the stem. Sonchus oleraceus has pointed auricles, but we can't see them in the photos.
You need to drop the last "o" in your Latin name to get iSpot to recognise it.
I'm not sure whether you have Sonchus oleraceus or Sonchus asper - the leaves look spiny and glossy enough to make the identification non-trivial, at which one has to look at the auricles.
However, I think that in the case of the broad yellow structures you have an aberration. I'd guess that they are broadened ligulate flowers.
Thank you all. Very interesting and I'll go back this weekend to get better photos.
I revisited this plant and indeed it had pointed auricles. The leaves weren't crinkled either, so I'm sure it's oleraceus.
Lat/Lng: 53.045, -1.7991
OS grid ref: SK135497