No you do not need a license to race. There are races for little kids and I'm sure they don't have one. There are 4-6yr range races and they don't need one. The last time i raced i didn't need one. So ya, u don't need one.
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You need a bike that will pass scrutineering (safety checks), safety gear (helmet, boots and body armour) then you need a racing licence (just buy one, you don't have to do a test) and away you go