White flowered plant
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Definitely that's what it is. It's on the yellow-flowered crucifer page in my book, but the description says the flowers can be white.
maybe you need to buy my book then (its all right,I don't get royalities!)
...for us rodents.
I won't be disputing Cruciferae spots with you!
happy to help anytime!
Lat/Lng: 51.3353, -1.1126
OS grid ref: SU619599