Spent an hour or so checking what is the common, yellow, sonchus-like-flowered Asteracea, flowering at this time of the year. I am quite sure that it is the Leontodon tuberosus, with runners up being Reichardia picroides (but that should have smooth achenes).
Posting for confirmation please!
Leontodon tuberosus - to confirm
Moderators: AlanOuten, MWP admin, IL-PINE
Leontodon tuberosus - to confirm
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