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I'm very sure this is Garlic Mustard, which should also have a feint garlicky smell to it when leaves are crushed.
It is edible, and the roots have a mild horseradish flavour.
Please be careful when eating wild plants, make absolutely sure you have identified correctly, and pick away from likely contamination areas.
...like, for instance, anywhere near to a footpath where dog walkers could possibly have been...
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Oddly, I was walking past these again not half an hour ago, they are located on just such a footpath next to a swathe of wild garlic. I was just remarking how astute it was of the wild garlic to locate itself there. "No-ones going to put me in a salad with a dog pooh bin not five feet away." it seemed to say.
Sadly, there are hardly any footpaths not contaminated with dog poo: and I've learned to avoid botanising within 50 yards of any car park or layby, for the same reason.
I have to say, the more I learn about botany, the less inclined I am to ever suggest that people eat/use plants picked at random from the wild - as opposed to grown from verified seed - as there are far too many opportunities for mis-identification!
I have nibbled this species twice this year and, although it refreshed my palette, I would definitely not like to use it in salad!
Lat/Lng: 50.9164, -0.1488
OS grid ref: TQ302146