I'd found a M. Marrast who was a French bigwig and present at one of Berlioz's concerts held at Versailles. After Googling Walther Marrast, it comes up with Walther Straram (an anagram!) but as a violinist.
In desperation I thought that Elphinstone was a misdirection and that it was the English version of the French "Elfin Stone".
In desperation I thought that Elphinstone was a misdirection and that it was the English version of the French "Elfin Stone".
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