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You may want to look at the photograph more carefully the seed pods are as you described -that is how I identified it
Appressed means tight against the stem which these most certainly are not! And the beaks are seedless.
I hope the new picture clarifies the issue
Still nothing like Hirschfeldia.
this is hard from these photos. The plant is infected with aphids so is not growing properly. After looking closely at the fruits as well as I can, Cicuta is right, Sinapis arvensis. The fruits are the unusual hairy form.
If you want to collect fresh material and post to me at Natioanl Musuem Wales CF10 3NP to double check please do. Tim Rich
Thanks - the is S. arvensis further down the slope but it is far more typical
Lat/Lng: 50.725, -1.861
OS grid ref: SZ099917