I've checked the guides and can't determine most of these marks at all. On the fish knife, I can't say if it's British or what origin. For the Hallmarks, the first could be absolutely anything, the 2nd is a cross, 3rd looks like a "6", 4th looks like a halberd and the last appears to have been a "B".
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Neither of these pieces have obvious sterling or fineness markings so we figure it'd be best to start in the plate section. Both of these feel like significant percentage of silver by texture and weight, and by the wear and construction.
Any help with these would be greatly appreciated.
Thanks!