It is classic habitat for Little Mouse-ear (Cerastium semidecandrum), a species I had looked for here in a previous year with no success. So I was pleasantly surprised to find numerous plants. This is a very rare species in West Yorkshire and the last record for this hectad (the Wakefield hectad SE32) appears to have been before 1888. It is so rare that the Flora of West Yorkshire (prematurely as it later turned out) declared it extinct, with this hectad being the only known historic location.
I am in no doubt that part of the reason it seems so rare is that it flowers early and then dies off, and also because it can by very tiny. Below is a typically plant from my location shown against a 1 pence coin. This plant was flowering and fruiting.