www.925-1000.com

Great, thanks a lot! Really makes sense.
Thanks also for the welcome to the forum, I'll try and help out with my limited knowledge.
Yottie
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Thank you to silverport for all the conjectures. Very interesting.
Silverly: If it was Hanoverian, and from London, that would mean 1717 (the date hallmark seems to correspond).
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The Z letter would mean 1974. However I've never seen an HKJ hallmark from Birmingham, only in Germany.

It's 16.5cm long (6.5 inches). Between the two outside prongs, it is 1.4 to 1.9cm (0.6 to 0.7 inches). Hope this can help!
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This fork was part of a lot of silver and silver-plate cutlery, bought in England, 15 years ago. There are only two hallmarks (possibly three). The first is the Roman numerals II with a kind of crown on top of it. Underneath, there is a Fleur de Lys (I do not know if it is part of the same hallmark ...