This looks like a repackaging of two of the symphonies originally released on the Sydney Symphony's house label during Ashkenazy's tenure there. The soloist in Symphony No. 4 is the same, and that entire Mahler cycle was recorded by the crew from Exton.
This raises the inevitable question: if Exton—apparently still in business—can release this set, why can't they release the two Mahler symphonies (2 & 6) they've already recorded with Honeck and the Pittsburgh Symphony?
James