The value of plated silver has dropped significantly in the last 20 years. Today's two worker household lifestyles do not leave much time for polishing silver nor do many have access to servants who can polish for them. Sterling silver is still desirable because it is seen as an investment in a semi-precious metal.
300 GBP in 1993 with inflation would be 555 GBP today if your set were in like new condition.
From my research, the 555 GBP is the best retail price your set would sell for.
In USA dollars, that is $818 today.
A private seller to a dealer or at auction can expect 30-60% of retail value.
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