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Jez
Hello,
I found this ammonite in the summer on the left hand side of the bay amongst the rocks.
the rock is very hard and heavy and full of shell fragments. Any ideas on what the name 
might be would be great. Click image for larger version - Name: IMG_20191230_142817_LI.jpg, Views: 70, Size: 267.97 KB Click image for larger version - Name: IMG_20191112_074542_LI.jpg, Views: 73, Size: 308.21 KB Click image for larger version - Name: IMG_20191230_143105_LI.jpg, Views: 56, Size: 236.50 KB
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Barrow Museum
Amaltheus margaritatus, which is the Zonal index species for the Margaritatus Zone, a component of the Upper Pliensbachian stage of the Lower Jurassic.  Visit andysfossils.com website for lots more on this and its relatives from Yorkshire.
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Elbert
Hello, it is an Amaltheid for sure, but I am not sure about margaritatus, perhaps Andy can give certainty of wich Amaltheus this is...

greets, Bert
the search is as valuable as the finds...
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estwing
Definitely Amaltheus, but as previously said by others, AndyS will surely have a positive ID for you
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AndyS
I‘d probably call this a large A. subnodosus,
it‘s a bit robust for an A. margaritatus.
There‘s a french paper, which would probably call this Amaltheus margaritatus forme subnodosus, but it would essentially mean the same thing.
Visit my liassic ammonites (+ other fossils) blog at andysfossils.com
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Jez
Hello, thankyou all for taking a look. I have spent several weeks trying to decide between A. margaritatus and A. bifurcus, so I'm glad to have put it to you all to have a look. I will happily put the name A. subnodosus to it. Thanks Andy.

Many thanks again, Jez 
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