The London Festival Symphony Orchestra

Appears as classical music orchestra conducted by on releases of series.

It was never confirmed that those artists (orchestra and conductor) exist indeed.
There are very likely pseudonyms for fraudulent reasons. That was usual practice of (producer of those releases and founder of ) according to first hand testimonial of .

It looks like those releases issued under and names were indeed previously issued on other labels under other names. It has been suggested that:
. [url=https://www.discogs.com/Rimsky-KorsakovLondon-Festival-Symphony-Orchestra-Thomas-Greene-Sch%C3%A9h%C3%A9razade-Suite-Symphonique-Opu/master/867860]Rimsky-Korsakov Schéhérazade[/url] could be [url=https://www.discogs.com/Rimsky-Korsakov-Sir-Eugene-GoossensLondon-Symphony-Orchestra-Scheherazade-Symphonic-Suite-After-The-/master/695952]LSO / Eugene Goossens on Everest[/url]
. [url=https://www.discogs.com/Anton-Dvorak-The-London-Festival-Symphony-Orchestra-Thomas-Greene-Symphonie-N5-Du-Nouveau-Monde/master/1211159]Dvorak New World Symphony[/url] could be [url=https://www.discogs.com/Dvorak-Leopold-Ludwig-Conducting-The-London-Symphony-Orchestra-New-World-Symphony/master/371680]LSO / Leopold Ludwig on Everest[/url]
. conductor on [url=https://www.discogs.com/Edvard-Grieg-Ronald-Smith-4-Thomas-GreeneLondon-Festival-Symphony-Orchestra-Concerto-Pour-Piano-Et-O/master/1037353]Grieg Piano Concerto and Peer Gynt Suites[/url] could be

Plus, [r=15344726] has a mention of and licenses, but [r=13590286] has no more those license mentions as the 3 other versions ([r=13115089], [r=10868674], [r=10758275]) with same cat# which have and instead of and on the 2 other versions.