Thought this might have been a different find for this area. Despite not putting into water , I think this is our usual find of Raja clavata.
No interactions present.
I have added your excellent reference for shark egg cases that you posted on another ID; people may not have seen it there,
I know what a keel is, but what does the 'field' you mention in your comment above refer to?
is the edge bit between the horns :)
Many thanks Graham.
..you think this is raja?
No problems with your ID. I did not realise that I had not ticked the box.
Lat/Lng: 51.381, 1.3145
OS grid ref: TR307698
Beach at low tide - high eulittoral area on sand.