By JACK WRIGHT FOR MAILONLINE Ministers have ‘war gamed’ emergency plans to cope with week-long blackouts this winter Documents warn food and water supplies and communications could be disrupted in event of outages Whitehall officials are stress-testing Programme Yarrow – the secret plan to cope with blackouts Plans were drawn up last year before Vladimir Putin launched his barbaric invasion of Ukraine But fears are growing that Russian aggression in the region could spark an energy security crisis Ministers have ‘war gamed’ emergency plans to cope with week-long blackouts this winter,…