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I've found the '91 club c'ship previews - Esso "Group N" was new for '90, and ran to basically international grp N rules and allowed slick tyres. It filled a gap between Prodsaloon and group A / Class 2 (supertouring). It also took a lot of the prodsaloon runners! Only the Firestone is referred to, so I think that is what the Uniroyal became - that was drastically down in numbers, half the entry being Suzuki Swifts that would be uncompetitive in the "up to 1600" class if improved to Group N spec.
If dates can be supplied I can look up / scan results - I was lucky enough to find a collection of pretty much every Autosport from early 80s to earlier this year. Unfortunately that's a lot of mags to scan through for small points, so extra info might be on a very random basis. I was too young to have been there in period, although I'm still fasincated by it, so first-hand knowledge is in short supply from me, I'm afraid.
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