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Flowers too small for Garden Arabis, but has a look of Cruciferae (Brassicaceae as it is now; what an ugly name!).
The more I look at it the more I have to agree with you Brock :) but there is something about it I can't put my finger on, it is in the old hard drive somewhere.
When first seen Valerian came to mind, not a Crucifer though. If memory serves me correct the flowers are somewhat lopsided with 4 or 5 petals.
this is the most dominant plant 'weed' here, there's more of this than umbellifers
Hi Ivan, have a look at some photos of hoary cress it might be that - it has a distinctive seed pod as well. Just a thought.
hoary cress was my first thought, thanks
Lat/Lng: 51.6648, -0.1337
OS grid ref: TQ291978