Gentianella amarella Autumn Gentian C DD N
There are quite a few sub species of this plant and I think this is probably G. amarella ssp amarella. In the dunes of Newborough it flowers in thousands in late summer some with surprisingly large, well branched plants. Like most Gentians it needs sunshine to open fully.
G. amarella is found in central southern and northern england but is sparser in Cornwall and in western Wales. There are patches of plenty in Scotland including the Orkneys and the north coast. It is also found in Ireland mostly in central regions.