Derbyshire escape punishment over the loss of their four-day Championship game with Kent at Chesterfield in September.
Batsman Alex Blake, who hit a 46-ball One-Day Cup century this summer, signs a new contract with Kent.
Teenage batsman Zak Crawley signs a long-term contract extension with Division Two side Kent.
England wicketkeeper-batsman Sam Billings extends his contract with Kent and is appointed as vice-captain.
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How to get into cricket - physical exertion with a chess-like element in matches which range from half an hour to five days.