Here's another sample from youtube: Steven Isserlis- J.S. Bach Cello Suite No. 2 in d minor; Prelude
I think you're right about his playing style on that first piece...I'v been looking for a video to confirm but not found it.
Both of those youtube recordings were really nice. I found this LP on eBay of Isserlis from 1989:
Are you familiar with it?