This was growing in among a crop of a cabbage family plant.
Note the dagger-like leaves.
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This has much more parallel-sided leaves with 2 lobes at the base. It is the sort of plant that you know when you see it, so if you are in doubt, it isn't it.
Lat/Lng: 53.2199, -1.7383
OS grid ref: SK175692
In among a crop of a Kale-like plant.