white-flowered crucifer from The Scilly Isles, slightly hairy, petals have yellow veins.
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my books say the veins should be purple or lilac so I ruled out Wild Radish. More checking on other sources confirms that they can also be yellow - thanks very much for your help.
And my book (the one wot I wrote) says "often with darker veins"!
Lat/Lng: 49.913, -6.324
OS grid ref: SV896103