LONDON: The risk of Britain exiting the European Union is a primary concern for Group of Seven finance chiefs amid fears a vote to leave the EU in just over a month could roil international markets. Finance ministers and central bank gov ernors of G7 countries meeting in Sendai Japan, yesterday were discussing the pos sibility of Brexit as one of the biggest risks on the horizon, according to officials from G7 members who declined to be identified. British Prime Minister David Cameron's decision to hold a referendum on Britain's membership ofthe EU on June 23 has split his ruling Conservative Party and drawn warnings from international bodies from the International Monetary Fund to the organization for Economic Cooperation and Development that an exit would cause financial shocks beyond Britain. Risks to financial markets and to British