suppose we should wait for better scaled pix before commenting but............. I'd suggest that not all of these pieces are related to each other,
and until we see better pix not possible to be sure. In view of the comment .... 'I cannot see a stamp anywhere else except for the jam jar', might suggest that this is the only Harbridge piece.
Outside of the very few cut designs for Harbridge, which can be seen in the Board's archive, I'm not aware of any catalogue pages that can be accessed to help for this factory.
The oval 'plate' may well be a trinket tray, and unrelated to the other pieces - the sort that our Grandmothers had on their dressing tables, mostly during the first half of the C20, on which stood cream jars, sticks, powder pots, ring holders etc.
The suggestion that the spoon is a solid silver spoon should be easy enough to confirm by the presence or otherwise of the lion passant - unfortunately I think most of these things turn out to be EPNS - although hope your were right first time.