To play in the Warrington Pool League Competitions each entrant needs to be playing regularly in the pool league.  For the early rounds this means that they need to have played just one game to be eligible.  By the time that finals day comes round anyone still in any of the competitions needs to have played at least half of the available local league games for their team.  A full set of rules are available here: 

http://manchesterpool.proboards49.com/index.cgi?board=warrington&action=display&thread=1779

You need to scroll down to get to the Competition Rules