Renault shares fall on fresh worries about potential break with Nissan

LONDON (Reuters) - Renault shares hit six-year lows on Monday after a media report that Nissan has accelerated secret contingency planning for a potential split from the French carmaker, the latest sign that the downfall of former boss Carlos Ghosn is roiling the 20-year alliance.At 1027 GMT, the shares were down 3.7%, languishing at the bottom of Paris' CAC 40 and the pan European STOXX 600 index .The plans include war-gaming a total split in engineering and manufacturing, as well as changes..