Russ, I agree with you completely about this 45 rpm Speakers Corner reissue. It's a shame they didn't continue with more 45 rpm reissues from the Decca catalog because this one is certainly superb. For some reason I can't fathom, it got poor write-ups by some of the reviewers when it was originally issued and it didn't sell well. Kai Seeman (the force behind Speakers Corner) decided not to continue the experiment in 45s. Such a shame. I'd love to see more of the wonderful Decca catalog released in 45 rpm with the same care that went into this one. Not only is this one of the great Decca recordings and one of the great performances of this music, the sonics of the reissue place it firmly in the top tier of my orchestral LPs.
I have recently acquired and listened the one-sided 45 RPM version of the Decca Mendelssohn in Scotland recording with Maag conducting reissued by Speakers Corner