Every summer, England’s chalk downlands are embroidered with a patch-work of wildflowers — from the horseshoe vetch’s yellow plumes to sainfoin’s pink spikes — all serenaded by an army of butterflies, says Vicky Liddell.
From mid June, on warm, sheep-moulded slopes in the south of England, a sparkling display of wildflowers spreads like confetti through the short grass. Vanilla-scented squinancywort, diminutive fairy flax and the purple-veined eyebright are…