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This is very much a late Romantic violin concerto. In contrast to Creith's contemporaries of the English pastoral school, her concerto tends toward dense, chromatic harmonies, shimmering textures, and long, flowing lines, somewhat reminiscent of Richard Strauss...
Very reminiscent of him (I chopped the end off your post because I don't know late Elgar). That doesn't necessarily make her his shadow - he spent a lot of his time recycling his own ideas. His oboe concerto is the only thing I listen to regulary.