** Greene King (GK) outperforms sharply lower FTSE250 as JPMorgan upgrades to "overweight" vs "neutral"
** Says UK pub sector, for all its challenges, offers goodexposure to UK consumer environment
** JPM flags major pub cos have generally stable &predictable cash flows with attractive yields & are well placedto improve returns through improved mix of sales & consolidation
** Decisive election result means robust UK economy morelikely now as cos/individuals holding back on investment (weakQ1 UK GDP seen as symptom) can now press ahead, say PMs;election outcome seen as more business-friendly
** Also, this yr's Rugby World Cup a likely magnet forpub-goers
** Shares in rival Spirit Pub, which GK plans tobuy, rise in tandem; CMA's decision on merger recently released;Barclays says from GK's statement in response, it reckons GKconsiders undertakings required as reasonable
** GK among stocks held by Premier AM's head of UK equitiesChris White (RM: tricia.wright1.thomsonreuters.com@reuters.net)