I agree Blackstonia Pefoliata, "Yellow wort", "Stone wort" probable has other names to it grows like a weed here in the shingle, has a bright yellow flower.
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog
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http://www.seasonalwildflowers.com/yellow-wort.html
In the sticks near Peterborough
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog