The instruction to search for allegations of US military abuse has been authorised by Mr Justice Turner at the high court in London as the bitter legacy of the conflict continues to work its way through the courts.
The latest development could prove highly embarrassing for future US/UK military cooperation if any documents contain critical comments by British soldiers of their American allies.
The order follows two court hearings before the judge in late October that dealt with claims brought by the law firm Leigh Day on behalf of two, unnamed Iraqi suspects who were arrested in 2008 in Basra, southern Iraq, and handed over to US custody.