Hello @carl-lloyd - only the first 15 challenges are free. After that you can choose to pay the £10 a month Standard subscription, which will give you access to carry on as you were, or you can decide whether to take up one of the structured courses.
There is a special offer on at the moment as we head to our 10th birthday celebrations, which you can read about at Share our biggest discount ever and get LOADS of prizes :-)
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