This is indeed wonderful: when I was born there were no commercial recordings of Brian; when I started listening to him in the 80s as a teenager only four of the symphonies had received professional recordings. Now practically all Brian's extant output will be on CD, with the glaring exception of the operas (and there are plans afoot to start remedying that).
Yeah, but I want Prometheus Unbound. That was supposed to be on par with the Gothic Symphony. Since the vocal score exists and I believe that would include the piano orchestral reduction, maybe John Pickard could reconstruct it based on what he did with Vision of Cleopatra.
