Measured about 10cm from tip to tip. And had a colouring reminiscent of tortoiseshell to the edge on the left of the picture.
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The Shark Trust have a very useful key for the ID of egg cases at
Thanks for the key Mike! I think I may have managed to ID this one because of it.
I just came across your post and was wondering whether you had sent it in to be recorded on the Great Eggcase Hunt website? If you haven't already then I can add it on to the Shark Trust's growing database which documents shark, skate and ray eggcases found around the coastline.
If you have any more findings then it would be great if you can please submit them via the online form at the following link: http://www.eggcase.org/recordfinds1.asp?rootid=6238&toptab=3
Lat/Lng: 50.8, -0.2
OS grid ref: TQ3203