[Orb] A little offtopic -> what's the classical music/sample used in "It's grim up north"?

I'm sorry for posting it here, but I've looked all over without finding the answer: What's the classical music/sample used in "It's grim up north" by The KLF? On the single it's titled "Jerusalem on the moors". I would love to hear the original classical version of this, so if anyone would have any info, please email me directly and/or to the list. Thank you :) Per Christian Frankplads (listen to my radioshow "experimenta" on my webpage) (WWW) http://www.experimenta.nu (EMAIL) pcf@pobox.com (ADR) schaeffersgt. 12, n-0558 oslo, norway (MOB) +4791528245 (FAX) +447092037927 (ICQ) 2888815