Thanks for the response, I just wanted to check before ordering the kit.
I did check the rules but they say that any Lipo's should be on the approved BRCA list, just seemed a bit vague and as what I want to do may be a bit different I thought I would check.
I'm glad that there has been a pragmatic approach to this as if there was a stipulation that you had to use dedicated 1S packs this would of been another cost and possible barrier preventing people trying another class and who already have saddle packs or who intend to buy them later on.