Reluctantly agree: hate to sound ungrateful - as far as I'm concerned ANY Lyrita release is welcome - but this seems an odd selection, and a pretty low priority given there must be rarer repertoire waiting to be released, although it will be interesting to hear Rubbra perform. Still, I too will be very happy to be proved wrong...
I can see the "historical interest" in having the composer as pianist in the Sinfonia Concertante and the recording of the Violin Concerto was the work's premiere. But is that enough to justify........?