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Motorsport UK Karting Yearbook 2021 - Gold Book
Probably one of the most important bits of information you'll need! If you intend to race in the many Karting events run under Motorsport UK rules and specs. The Motorsport UK Karting Yearbook 2021, or what is know as the "Gold Book" will be needed.
You can find it attached to this post for direct download. Or you can find it directly from Motorsport UK here.