Both of those youtube recordings were really nice. I found this LP on eBay of Isserlis from 1989:
http://www.ebay.com/itm/RARE-VIRGIN-DIGITAL-1989-Elgar-Bloch-STEVEN-ISSERLIS-Cello-HICKOX-VC-7-90735-1-/360413399680?pt=Music_on_Vinyl&hash=item53ea500a80
Are you familiar with it?
No, I’m not but that’s really quite a find.