Hello and thank you for your question, which I will be happy to assist you with.
A Part 20 claim is an additional claim other than the original claim by the claimant. So say someone (A) has made a claim against another (B). A is the claimant and B is the defendant.
However, B believes that he also has a case against A and makes a Part 20 claim against him. That then makes B a Part 20 claimant and A a part 20 defendant.
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