Hundereds of these washed up recently along the shoreline
No interactions present.
The difficult one to separate is Echinocardium flavescens (see http://www.habitas.org.uk/marinelife/species.asp?item=ZB4080). The jury is out about how common it is. There has probably been a lot of confusion over the years. Its not in Heyward and Ryland...which doesn't help. This normally lives in areas with coarser sediment than Ainsdale Beach.
The other is Bryssopsis lyrifera which, once the spines are removed has a knobbly apperance with the spines set out in a petal-like shape.
Lat/Lng: 53.59845, -3.07356
OS grid ref: SD290118
All along the shore-line