Tchaikovsky certainly had plans for a seventh symphony, but these were transformed instead into a proposed third piano concerto. This CD features both.
Semyon Bogatryryev relied on the composer's sketches for the symphony, the resulting piano concerto, and Taneyev's piano reworking to produce his version of the seventh. It is not as lyrical and inventive as one would expect. Perhaps Tchaikovsky was right to discard it: himself judging this work, Tchaikovsky wrote that he "composed for the sake of composing something."
In the judgement of this reviewer, only the development of the first movement displays any passion and power. As for the andante second movement, it lacks much of the grace that one would expect from this composer. The writing seems somewhat contrived, not heartfelt. The scherzo at least retains some wit and bite, but the finale is often laboured.
In conclusion, I can only feel that (unlike those of, say Mahler and Elgar) the sketches of Tchaikovsky's last proposed symphony should have been left alone. The result is just a mere curiosity, one of the least interesting of his symphonies; but then, it's not really Tchaikovsky's at all. I don't think any fault can be laid at the feet of the London Philharmonic, as they give of their best. The sound quality of the CD is very good.
The third piano concerto, since its origins lie with the proposed seventh symphony, allows a direct comparison to be made with it on this CD. And, it's true; it does work better as a piano concerto. It's a shame that Tchaikovsky died with only the first movement completed. (Taneyev had a go at completing it, but that is not recorded here.) It has a very strong cadenza and Geoffrey Tozer on this CD gives it justice.
Three stars for the symphony; four for the concerto; and four for the playing throughout. Result: four stars.