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Are both new to me. After a quick trawl of references, I would certainly agree with both identifications, but with no real confidence.
I love seeing unfamiliar organisms on this site: thanks for posting them!
You're very welcome, I'm going through all my old beach pics and will post up anything I find that I think people might not have seen before / be familiar with over the next few weeks :)
Lat/Lng: 51.3794, 1.4476
OS grid ref: TR400701