Rehab singing star Amy Winehouses hubby Blake Fielder Civil is reportedly heading back to jail after failing a court-ordered drug tests. Fielder-Civil was released from prison early after serving almost a year behind bars in relation to an attack on a pub landlord in 2006. As part of his early release deal, Fielder-Civil agreed to check straight into a rehab in Surrey, England, and spend a month having treatment for his drug addiction. But the 26-year-old is now said to have failed mandatory drugs tests which will see him sent back to prison at the end of the month to serve out the remainder of his sentence, meaning he could stay behind bars until early 2010.A source tells Britain’s The Sun newspaper, "If he had stayed in prison last month rather than taking the rehab option he was set to be released at the end of this month. He’s blown it." After hearing the news, Fielder-Civil reportedly left the Life Works clinic to visit his wife at a London hospital, where she is being treated after suffering an adverse reaction to prescription medication last month, to beg her not to give up on their failing marriage. The source adds, "Blake did a runner. He turned up in hospital and hell broke loose - everyone was totally shocked."He was asking Amy to forgive him. As he was going back inside anyway he felt he didn’t have much to lose."