What dead sea creature is this?

[Simbu]

I'm pretty sure this is a young shark of some kind, does anyone know what species?

Found on a Pembrokeshire beach yesterday!

[Simbu]

Thanks for the replies!

Apart from giving it a cursory prod with my foot we didn't touch it. It looked like the seagulls had already had a go at it - there was a gaping hole where its gills used to be.