According to Dutton's blurb, it is Balakirev's orchestration that is used in this performance. This is familiar from the old 1954 Decca recording with Friedrich Gulda and Adrian Boult conducting, now available on a DG Gulda collection. According to Dutton's blurb Balakirev adds 'modern brass and cor anglais' but the wikipedia article on Balakirev's orchestration suggests only the instruments in Chopin's original are employed - could there be two different Balakirev versions? An obvious difference from Chopin's original in the Gulda / Boult performance is the clarinet playing the second theme in the introduction.