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The NSCC was a kind of N+. I think the NSCC came about as a single-class championship as the previous Group N (Esso in the early 90s) had become 3 or 4 one make championships running at the same time ie you had to have a Civic or EsCos or M3 to win your class.
From what I know of the Astras that ran in the NSCC, and the super-production 306s, engine regs weren't too far apart, if at all. There was more engine work allowed than just blue-printing; I think a single throttle body was used, and cams were limited in lift. The best 2l engines still produced upwards of 220bhp, though.
For one year the NSCC and Group B BTCC both ran, then the NSCC got absorbed into class B, then that died. A shame, as it's took away a non-one make feeder into BTCC - a bit of variety that we don't see at that level anymore.
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