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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 2020, or what is know as the "Gold Book" will be needed.
You can find a direct link to it here (Motorsport UK), or you will also find it attached to this post incase the link etc is ever down.