A reissue of the very fine LSO/Butt recording appeared on Regis some while ago:
https://www.amazon.co.uk/gp/product/B004754TCY/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 (https://www.amazon.co.uk/gp/product/B004754TCY/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1)
When I hear this work I'm inclined to think that the first movement is Glazunov's finest symphonic utterance.
I enjoyed all of Butt`s Glazunov. He certainly had a great orchestra to work with and I was sorry he never did them all. Does he still work anywhere? Since the demise of ASV he kind of vanished.
He died August 28 2014 according to this (https://en.wikipedia.org/wiki/Yondani_Butt) and I presume its sources.
(On consideration that doesn't really answer your question...)
I completely agree with Alan on his assessment that the 1st movement is one of Glazunov's finest and most inspired. Symphonies 4, 5 & 6 are his best of the lot.
Before he died Butt actually recorded quite a lot for Nimbus - Beethoven, Brahms, Schumann and Tchaikovsky (4-6) symphonies, for example.
I forgot to mention his Raff Symphony No. 3 is imho unsurpassed.
Please correct me if I am wrong but I was not aware that Yondani Butt had recorded Raff's 3rd symphony. The 5th, yes.
My mistake - The recording of Symphony No. 3 I was referring to was by Francesco D'Avalos. Sorry...
A wonderful movement. I like Glazunov.