Thank you for writing in Mrs Collins, but unfortunately without an image of the mark and being able to see the shape of the shield impression around the maker's mark, which is vital, we are unable to give an opinion with accuracy about the sterling silver hallmarks, which include the maker's mark.
What we can deduce, by UK country mark (the lion) denoting sterling silver, is a broad time frame, (no info about the maker, but a broad time framework to research within) by examining the orientation of the lion.
If the lion is walking forward and not looking to the side at you, this position is the proverbial LION PASSANT and appears on UK .925 STERLING SILVER ca 1831 - Present.
