A claim will not be fundable unless it has good legal merits.  A 70% chance of success (on the merits) is sometimes quoted and can be erroneously equated with a high chance of a successful outcome generally.  In reality, it’s hard to give an exact number 


The legal merits should only be one element of a funder’s investment policy


As any claim progresses it constantly evolves.  The legal merits may change, for example, following disclosure obliging a prudent funder to withdraw if a satisfactory settlement can’t be reached 


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