Being something of a self confessed 'anorack' when it comes to identifying all types of marine species I have now identified it. It is in fact a blond stimray (latin name.......vibratus stimulatis) These little critters are often washed up after storms. Apparently they are very popular with women who keep them as pets (and some blokes...apparently) They sometimes grow to quite large proportions and are mainly nocternal, seeking out dark tight creviices, and can live out of water for a while; as long as they have a damp moist crevice to 'hide in'.
Not all of the species are white. The largest ones are often jet black in colour. The peculiar characteristic of them is they vibrate slightly when the have found a comfortable habitat. Scientists think they can create their own electrical current to make this happen. Alas their lifespan is quite short, and when they die, they are sometimes thrown away by their pet owners..........hence they sometimes get washed up on the shore.
Well I hope this has clarified the identity of this very fishy smelling character.
BAZACODBASHA