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       Can anyone put an i.d on this ammonite fossil please.

As you can see it's the very last remains of an ammonite (I think) which was found on shingle banks at the mouth of the River Spey, NE Scotland.  It's done very well to survive at all and I think the host rock has travelled from the Golspie/Brora area of Sutherland as an erratic so probably Jurassic in age.
The "tuning fork" arrangement of the ribs might narrow the choice down ?
I apologise for lack of scale, fossil about 1 inch long.

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Barrow Museum
Could be one of many.  It resembles a Perisphinctid, tending to suggest Upper Jurassic, which would be in keeping with your suggestion of drift along the shore from the coastal outcrop of the Helmsdale coast or could be in glacial material derived from Jurassic cropping out on the floor of the North Sea.  Apart from what appears to be a circular cross-section and a prominent bifurcating rib, there's not much more to tell.  At 1" across, if you cracked it open, there's not much chance of finding anything else inside.  A microfossil analysis could provide a more definitive date for the rock, but this would need to be done by a professional biostratigrapher or academic.
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Barrow Museum, Thank you for your reply.  We'll (Elgin Museum) give the information to the collector, I still can't believe she managed to find a fossil on a very mobile shingle beach ! 
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