Confidence: It's likely to be this, but I can't be certain.
Notes: Flowers are probably a little too large and not quite the right shape for pure E. micrantha, nor does the habitat look right. The leaves and habit of the plant are more like E. nemorosa. However, best not to base identifications of hybrids on limited material, and the plants are heavily infected with the parasitic rust fungus, Coleosporium tussilaginis. Alan (BSBI Euphrasia referee)