Cork could very well see a 5th A320 in October. I think it will depend more on what EI want to do with the Crew base at LGW than their ambitions for Cork. If the ORK-LGW performs well but EI want to shut the LGW crew base the A320 number 5 would be close to certain, ORK would gain "half" an aircraft. Im sure there are routes on the EI radar and if LGW does work out it would seem to be a very small risk, assuming the LHR routes hold up OK too.
Brian.